Introduction

We can customize Elastic Search in Liferay, so that whenever a user is searching for a keyword in Liferay then the search results would not only display the results for that search keyword but the search results would also display the results for the synonyms of that search keyword.

We can configure synonyms for English and Arabic languages and that would work for Content (Blogs, Web content, Documents, etc.) and Commerce products as well.

Configuration

I have used the Liferay 7.1 with Fix Pack 12, Elasticsearch 6.5.0, Commerce 2.0.4 software stack for synonyms configuration.

Let's say that I have a Commerce product containing the word "tiny" and I search for the word "small". Follow the below steps to setting up synonyms for multiple languages.

1. Navigate to Control Panel → Configuration → System Settings → Platform Section → Search

   

2. Navigate to the ElasticSearch6 tab where we can see all the configurations related to elastic search.

   

3. Go to "Additional index configurations".  Copy below index configurations. This section is used to configure additional indexes to support synonyms for English and Arabic languages. I have customized the default index configurations ‘index-settings.json’ file that is available in the Elastic Search module of your Liferay bundle.

   {
       "analysis":{
                     "filter":{
                         "arabic_stop":{
                             "type":"stop",
                             "stopwords":"_arabic_"
                         },
                         "arabic_stemmer":{
                             "type":"stemmer",
                             "language":"arabic"
                         },
                         "liferay_filter_synonym_ar":{
                             "type":"synonym",
                             "lenient":"true",
                             "synonyms":[
                                 "سعيد,مرح"
                             ]
                         },
                         "english_stemmer":{
                             "type":"stemmer",
                             "language":"english"
                         },
                         "english_possessive_stemmer":{
                             "type":"stemmer",
                             "language":"possessive_english"
                         },
                         "english_stop":{
                             "type":"stop",
                             "stopwords":"_english_"
                         },
                         "liferay_filter_synonym_en":{
                             "type":"synonym_graph",
                             "lenient":"true",
                             "synonyms":[
                                 "small,tiny"
                             ]
                         }
                     },
                     "analyzer":{
                          "liferay_analyzer_en":{
                             "filter":[
                                 "english_possessive_stemmer",
                                 "lowercase",
                                 "liferay_filter_synonym_en",
                                 "english_stop",
                                 "english_stemmer"
                             ],
                             "tokenizer":"standard"
                         },
                         "keyword_lowercase":{
                             "filter":"lowercase",
                             "tokenizer":"keyword"
                         },
                         "liferay_analyzer_ar":{
                             "tokenizer":"standard",
                             "filter":[
                                 "lowercase",
                                 "decimal_digit",
                                 "arabic_stop",
                                 "liferay_filter_synonym_ar",
                                 "arabic_stemmer"
                             ]
                         }
                     }
                 }
   }

   It should look like the image below and where we wrote our list of synonyms in the "synonyms".

   

4. Search for the “synonyms” part under “liferay_filter_synonym_ar” field. Define all the synonyms for the Arabic language.
5. Search for the “synonyms” part under “liferay_filter_synonym_en” field. Define all the synonyms for the English language.
6. Go to "Override type mappings" and copy the below contents into the text area input box. I have customized the default index configurations ‘liferay-type-mappings.json’ file that is available in the Elastic Search module of your Liferay bundle.

   {
       "LiferayDocumentType": {
           "date_detection": false,
           "dynamic_templates": [
               {
                   "template_long_sortable": {
                       "mapping": {
                           "store": true,
                           "type": "long"
                       },
                       "match": "*_sortable",
                       "match_mapping_type": "long"
                   }
               },
               {
                   "template_string_sortable": {
                       "mapping": {
                           "store": true,
                           "type": "keyword"
                       },
                       "match": "*_sortable",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_geolocation": {
                       "mapping": {
                           "fields": {
                               "geopoint" : {
                                   "store": true,
                                   "type": "keyword"
                               }
                           },
                           "store": true,
                           "type": "geo_point"
                       },
                       "match": "*_geolocation"
                   }
               },
               {
                   "template_ddm_keyword": {
                       "mapping": {
                           "store": true,
                           "type": "keyword"
                       },
                       "match": "ddm__keyword__*",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_expando_keyword": {
                       "mapping": {
                           "analyzer" : "keyword_lowercase",
                           "store": true,
                           "type": "text"
                       },
                       "match": "expando__keyword__*",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_ar": {
                       "mapping": {
                           "analyzer": "arabic",
                           "search_analyzer": "liferay_analyzer_ar",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_ar\\b|\\w+_ar_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_bg": {
                       "mapping": {
                           "analyzer": "bulgarian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_bg\\b|\\w+_bg_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_ca": {
                       "mapping": {
                           "analyzer": "catalan",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_ca\\b|\\w+_ca_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_cs": {
                       "mapping": {
                           "analyzer": "czech",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_cs\\b|\\w+_cs_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_da": {
                       "mapping": {
                           "analyzer": "danish",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_da\\b|\\w+_da_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_de": {
                       "mapping": {
                           "analyzer": "german",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_de\\b|\\w+_de_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_el": {
                       "mapping": {
                           "analyzer": "greek",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_el\\b|\\w+_el_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_en": {
                       "mapping": {
                           "analyzer": "english",
                           "search_analyzer": "liferay_analyzer_en",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_en\\b|\\w+_en_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_es": {
                       "mapping": {
                           "analyzer": "spanish",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_es\\b|\\w+_es_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_eu": {
                       "mapping": {
                           "analyzer": "basque",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_eu\\b|\\w+_eu_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_fi": {
                       "mapping": {
                           "analyzer": "finnish",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_fi\\b|\\w+_fi_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_fr": {
                       "mapping": {
                           "analyzer": "french",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_fr\\b|\\w+_fr_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_hi": {
                       "mapping": {
                           "analyzer": "hindi",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_hi\\b|\\w+_hi_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_hu": {
                       "mapping": {
                           "analyzer": "hungarian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_hu\\b|\\w+_hu_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_hy": {
                       "mapping": {
                           "analyzer": "armenian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_hy\\b|\\w+_hy_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_id": {
                       "mapping": {
                           "analyzer": "indonesian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_id\\b|\\w+_id_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_it": {
                       "mapping": {
                           "analyzer": "italian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_it\\b|\\w+_it_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_ja": {
                       "mapping": {
                           "analyzer": "kuromoji",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_ja\\b|\\w+_ja_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_ko": {
                       "mapping": {
                           "analyzer": "cjk",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_ko\\b|\\w+_ko_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_nl": {
                       "mapping": {
                           "analyzer": "dutch",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_nl\\b|\\w+_nl_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_no": {
                       "mapping": {
                           "analyzer": "norwegian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_nb\\b|\\w+_nb_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_pl": {
                       "mapping": {
                           "analyzer": "polish",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_pl\\b|\\w+_pl_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_pt": {
                       "mapping": {
                           "analyzer": "portuguese",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_pt\\b|\\w+_pt_PT\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_pt_br": {
                       "mapping": {
                           "analyzer": "brazilian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "*_pt_BR",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_ro": {
                       "mapping": {
                           "analyzer": "romanian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_ro\\b|\\w+_ro_RO\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_ru": {
                       "mapping": {
                           "analyzer": "russian",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_ru\\b|\\w+_ru_RU\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_sv": {
                       "mapping": {
                           "analyzer": "swedish",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_sv\\b|\\w+_sv_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_th": {
                       "mapping": {
                           "analyzer": "thai",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_th\\b|\\w+_th_TH\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_tr": {
                       "mapping": {
                           "analyzer": "turkish",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_tr\\b|\\w+_tr_TR\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_zh": {
                       "mapping": {
                           "analyzer": "smartcn",
                           "store": true,
                           "term_vector": "with_positions_offsets",
                           "type": "text"
                       },
                       "match": "\\w+_zh\\b|\\w+_zh_[A-Z]{2}\\b",
                       "match_mapping_type": "string",
                       "match_pattern": "regex"
                   }
               },
               {
                   "template_ddm": {
                       "mapping": {
                           "store": true,
                           "type": "text"
                       },
                       "match": "ddm__*",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_expando": {
                       "mapping": {
                           "store": true,
                           "type": "text"
                       },
                       "match": "expando__*",
                       "match_mapping_type": "string"
                   }
               },
               {
               "template_commerce_attribute": {
                   "mapping": {
                       "store": true,
                       "type": "keyword"
                   },
                   "match": "*_VALUES_NAMES",
                   "match_mapping_type": "string"
                   }
               },
               {
                   "template_commerce_attribute_id": {
                       "mapping": {
                           "store": true,
                           "type": "keyword"
                       },
                       "match": "*_VALUE_ID",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_commerce_specification": {
                       "mapping": {
                           "store": true,
                           "type": "keyword"
                       },
                       "match": "*_VALUE_NAME",
                       "match_mapping_type": "string"
                   }
               },
               {
                   "template_terms_set_required_matches": {
                       "mapping": {
                           "store": true,
                           "type": "integer"
                       },
                       "match": "*_required_matches",
                       "match_mapping_type": "string"
                   }
               }
           ],
           "properties": {
               "ancestorOrganizationIds": {
                   "store": true,
                   "type": "keyword"
               },
               "articleId": {
                   "analyzer": "keyword_lowercase",
                   "store": true,
                   "type": "text"
               },
               "assetCategoryId": {
                   "store": true,
                   "type": "keyword"
               },
               "assetCategoryIds": {
                   "store": true,
                   "type": "keyword"
               },
               "assetTagId": {
                   "store": true,
                   "type": "keyword"
               },
               "assetTagIds": {
                   "store": true,
                   "type": "keyword"
               },
               "assetTagNames": {
                   "fields": {
                       "raw" : {
                           "type": "keyword"
                       }
                   },
                   "store": true,
                   "term_vector": "with_positions_offsets",
                   "type": "text"
               },
               "assetVocabularyId": {
                   "store": true,
                   "type": "keyword"
               },
               "assetVocabularyIds": {
                   "store": true,
                   "type": "keyword"
               },
               "classTypeId": {
                   "store": true,
                   "type": "keyword"
               },
               "companyId": {
                   "store": true,
                   "type": "keyword"
               },
               "configurationModelAttributeName": {
                   "store": true,
                   "type": "keyword"
               },
               "configurationModelFactoryPid": {
                   "store": true,
                   "type": "keyword"
               },
               "configurationModelId": {
                   "store": true,
                   "type": "keyword"
               },
               "content": {
                   "store": true,
                   "term_vector": "with_positions_offsets",
                   "type": "text"
               },
               "createDate": {
                   "format": "yyyyMMddHHmmss",
                   "store": true,
                   "type": "date"
               },
               "dataRepositoryId": {
                   "store": true,
                   "type": "keyword"
               },
               "ddmContent": {
                   "store": true,
                   "term_vector": "with_positions_offsets",
                   "type": "text"
               },
               "ddmStructureKey": {
                   "store": true,
                   "type": "keyword"
               },
               "ddmTemplateKey": {
                   "store": true,
                   "type": "keyword"
               },
               "defaultLanguageId": {
                   "store": true,
                   "type": "keyword"
               },
               "description": {
                   "store": true,
                   "term_vector": "with_positions_offsets",
                   "type": "text"
               },
               "discussion": {
                   "store": true,
                   "type": "keyword"
               },
               "displayDate": {
                   "format": "yyyyMMddHHmmss",
                   "store": true,
                   "type": "date"
               },
               "emailAddress": {
                   "store": true,
                   "type": "keyword"
               },
               "endTime": {
                   "store": true,
                   "type": "long"
               },
               "entryClassName": {
                   "store": true,
                   "type": "keyword"
               },
               "entryClassPK": {
                   "store": true,
                   "type": "keyword"
               },
               "expirationDate": {
                   "format": "yyyyMMddHHmmss",
                   "store": true,
                   "type": "date"
               },
               "extension": {
                   "store": true,
                   "type": "keyword"
               },
               "fileEntryTypeId": {
                   "store": true,
                   "type": "keyword"
               },
               "folderId": {
                   "store": true,
                   "type": "keyword"
               },
               "geoLocation": {
                   "fields": {
                       "geopoint" : {
                           "store": true,
                           "type": "keyword"
                       }
                   },
                   "store": true,
                   "type": "geo_point"
               },
               "groupId": {
                   "store": true,
                   "type": "keyword"
               },
               "groupIds": {
                   "store": true,
                   "type": "keyword"
               },
               "groupRoleId": {
                   "store": true,
                   "type": "keyword"
               },
               "head": {
                   "store": true,
                   "type": "keyword"
               },
               "hidden": {
                   "store": true,
                   "type": "keyword"
               },
               "id": {
                   "store": true,
                   "type": "keyword"
               },
               "languageId": {
                   "store": true,
                   "type": "keyword"
               },
               "layoutUuid": {
                   "store": true,
                   "type": "keyword"
               },
               "leftOrganizationId": {
                   "store": true,
                   "type": "keyword"
               },
               "mimeType": {
                   "store": true,
                   "type": "keyword"
               },
               "modified": {
                   "format": "yyyyMMddHHmmss",
                   "store": true,
                   "type": "date"
               },
               "nodeId": {
                   "store": true,
                   "type": "keyword"
               },
               "organizationId": {
                   "store": true,
                   "type": "keyword"
               },
               "organizationIds": {
                   "store": true,
                   "type": "keyword"
               },
               "parentCategoryId": {
                   "store": true,
                   "type": "keyword"
               },
               "parentCategoryIds": {
                   "store": true,
                   "type": "keyword"
               },
               "parentOrganizationId": {
                   "store": true,
                   "type": "keyword"
               },
               "path": {
                   "store": true,
                   "type": "keyword"
               },
               "priority": {
                   "store": true,
                   "type": "double"
               },
               "properties": {
                   "store": true,
                   "type": "keyword"
               },
               "publishDate": {
                   "format": "yyyyMMddHHmmss",
                   "store": true,
                   "type": "date"
               },
               "readCount": {
                   "store": true,
                   "type": "keyword"
               },
               "recordSetId": {
                   "store": true,
                   "type": "keyword"
               },
               "removedByUser": {
                   "type": "keyword"
               },
               "removedDate": {
                   "format": "yyyyMMddHHmmss",
                   "store": true,
                   "type": "date"
               },
               "rightOrganizationId": {
                   "store": true,
                   "type": "keyword"
               },
               "roleId": {
                   "store": true,
                   "type": "keyword"
               },
               "roleIds": {
                   "store": true,
                   "type": "keyword"
               },
               "rootEntryClassName": {
                   "store": true,
                   "type": "keyword"
               },
               "rootEntryClassPK": {
                   "store": true,
                   "type": "keyword"
               },
               "scopeGroupId": {
                   "store": true,
                   "type": "keyword"
               },
               "screenName": {
                   "store": true,
                   "type": "keyword"
               },
               "size": {
                   "store": true,
                   "type": "keyword"
               },
               "status": {
                   "store": true,
                   "type": "keyword"
               },
               "subtitle": {
                   "store": true,
                   "type": "text"
               },
               "teamIds": {
                   "store": true,
                   "type": "keyword"
               },
               "threadId": {
                   "store": true,
                   "type": "keyword"
               },
               "title": {
                   "store": true,
                   "term_vector": "with_positions_offsets",
                   "type": "text"
               },
               "treePath": {
                   "store": true,
                   "type": "keyword"
               },
               "type": {
                   "store": true,
                   "type": "keyword"
               },
               "uid": {
                   "store": true,
                   "type": "keyword"
               },
               "userGroupId": {
                   "store": true,
                   "type": "keyword"
               },
               "userGroupIds": {
                   "store": true,
                   "type": "keyword"
               },
               "userId": {
                   "store": true,
                   "type": "keyword"
               },
               "userName": {
                   "store": true,
                   "type": "keyword"
               },
               "version": {
                   "store": true,
                   "type": "keyword"
               },
               "visible": {
                   "store": true,
                   "type": "keyword"
               },
               "advanceStatus": {
               "store": true,
               "type": "keyword"
               },
               "commerceAccountGroupIds_required_matches": {
                   "store": true,
                   "type": "integer"
               },
               "commerceAccountId": {
                   "store": true,
                   "type": "keyword"
               },
               "couponCode": {
                   "store": true,
                   "type": "keyword"
               },
               "criterionType_organization_required_matches": {
                   "store": true,
                   "type": "integer"
               },
               "criterionType_role_required_matches": {
                   "store": true,
                   "type": "integer"
               },
               "criterionType_user_group_required_matches": {
                   "store": true,
                   "type": "integer"
               },
               "criterionType_user_required_matches": {
                   "store": true,
                   "type": "integer"
               },
               "entryModelClassName": {
                   "store": true,
                   "type": "keyword"
               },
               "optionsNames": {
                   "store": true,
                   "type": "keyword"
               },
               "orderOrganizationId": {
                   "store": true,
                   "type": "keyword"
               },
               "orderStatus": {
                   "store": true,
                   "type": "keyword"
               },
               "productTypeName": {
                   "store": true,
                   "type": "keyword"
               },
               "specificationOptionsIds": {
                   "store": true,
                   "type": "keyword"
               },
               "specificationOptionsNames": {
                   "store": true,
                   "type": "keyword"
               },
               "targetType": {
                   "store": true,
                   "type": "keyword"
               },
               "defaultImageFileUrl": {
                   "store": true,
                   "type": "keyword"
               }
           }
       }
   }

7. Save your changes.
8. Navigate to Control Panel → Configuration → Search and execute "Reindex all search indexes" under the section "Index Actions".
   Execute ‘Reindex all search indexes’ after making any change in the synonyms in order to reflect the changes.

   

9. Navigate to the search page and try to search with the keyword which has synonyms defined in the above steps. We will get the search results with the synonyms. 

10. See the below search results with synonyms in the Arabic language.

    

11. See the below search results with synonyms in the English language.

    

Sound Interesting right?

Liferay is using Elastic Search for indexing its documents so all kinds of elastic search configuration and customization can be done within Liferay too.