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Hi ,

I wanted to know how to upgrade he below code snippet of Liferay 7.1 to Liferay 7.4.Please suggest. 

public final void serveResource(ResourceRequest request, ResourceResponse response) throws IOException {
        
        ThemeDisplay themeDisplay = (ThemeDisplay)request.getAttribute(WebKeys.THEME_DISPLAY); 
        String keywords = ParamUtil.getString(request, "keywords");
        SearchContext searchContext = new SearchContext();
        searchContext.setCompanyId(themeDisplay.getCompanyId());
        searchContext.setEntryClassNames(new String[] {User.class.getName()});
        
        BooleanQuery fullQuery = BooleanQueryFactoryUtil.create(searchContext);
        
        BooleanQuery searchQuery = BooleanQueryFactoryUtil.create(searchContext);
        searchQuery.addRequiredTerm(Field.ENTRY_CLASS_NAME, User.class.getName());
        
        // Setting up filters.
        fullQuery.add(searchQuery, BooleanClauseOccur.MUST);
        
        //Search for users with Role Mentor
        BooleanQuery userRoleIdQry = BooleanQueryFactoryUtil.create(searchContext);
        Role role = RoleLocalServiceUtil.getRole(themeDisplay.getCompanyId() ,"UIS_ROLE");
        userRoleIdQry.addRequiredTerm("roleIds", role.getRoleId());
        fullQuery.add(userRoleIdQry, BooleanClauseOccur.MUST);
                       
         // keyword as username
        BooleanQuery userFullNameQuery = BooleanQueryFactoryUtil.create(searchContext);
        userFullNameQuery.addRequiredTerm(FULL_NAME, keywords, true);
        fullQuery.add(userFullNameQuery, BooleanClauseOccur.MUST);

        
        // Exclude inactive users
        BooleanQuery statusQuery = BooleanQueryFactoryUtil.create(searchContext);
        statusQuery.addExactTerm(Field.STATUS, WorkflowConstants.STATUS_INACTIVE);
        fullQuery.add(statusQuery, BooleanClauseOccur.MUST_NOT);
        
        try {
            LOG.debug("******************************fullQuery*******************************************"+fullQuery);
            Hits hits = SearchEngineUtil.search(searchContext, fullQuery);
            if (Validator.isNull(hits) || hits.getLength() == 0) 
                LOG.debug("No records match search criteria");
            JSONArray results = JSONFactoryUtil.createJSONArray();
            
            for (Document document : hits.getDocs())   {
                Long casePK = Long.parseLong(document.getField(Field.ENTRY_CLASS_PK).getValue());
                JSONObject jsonObj = JSONFactoryUtil.createJSONObject();
                jsonObj.put("id", casePK);
                jsonObj.put(Field.NAME, document.getField(FULL_NAME).getValue());
                results.put(jsonObj);
            }
            response.getWriter().write(results.toString());
          } catch (SearchException e) {
             LOG.error("Error while searching users ", e);
         }        
       }