Hi,1) In liferay 7 search portlet we need to customize to sort the results like title name ect.
2) We need to add the more input fields fileTypess(like adding file tyle .pdf,.docx) and only get file same file types and did not search any other places.in 6.2 start.jsp file added like below files.<aui:input inlineField="<%= true %>" label="File Type (pdf, docx, etc)" name='<%= namespace + "fileExtension" %>' size="30" title="extension" type="text" useNamespace="<%= false %>"/> 
and got the value in search.jsp and that value passed in main-search.jsp fileif(Validator.isNotNull(fileExtension) && fileExtension != ""){
    Query fileExtensionQuery = StringQueryFactoryUtil.create("entryClassName:com.liferay.portlet.documentlibrary.model.DLFileEntry +extension:"+fileExtension);
    BooleanClause fileExtensionClause = BooleanClauseFactoryUtil.create(searchContext, fileExtensionQuery, BooleanClauseOccur.MUST.getName());
    booleanClauseList.add(fileExtensionClause);}
 if(booleanClauseList.size()>0){
        BooleanClause[] booleanClause = new BooleanClause[booleanClauseList.size()];
        booleanClause = booleanClauseList.toArray(booleanClause);
        searchContext.setBooleanClauses(booleanClause);
    //searchContext.setBooleanClauses(new BooleanClause[] {fileExtensionClause,pbDocumentTypeClause});
    } 
and we got only file extension but in liferay 7 how we will implement same functionality?
we need to implement it only custom portlet and using hook we can implement? if we are able to implement using hook the what steps we need to take care?.