code: private SearchResult<String> searchObjectIds(String indexName, QueryBuilder queryBuilder, int start, int size, List<String> sortOptions, String docType) throws IOException {
  
          SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
          searchSourceBuilder.query(queryBuilder);
          searchSourceBuilder.from(start);
          searchSourceBuilder.size(size);
  
          if (sortOptions != null && !sortOptions.isEmpty()) {
  
              for (String sortOption : sortOptions) {
                  SortOrder order = SortOrder.ASC;
                  String field = sortOption;
                  int index = sortOption.indexOf(":");
                  if (index > 0) {
                      field = sortOption.substring(0, index);
                      order = SortOrder.valueOf(sortOption.substring(index + 1));
                  }
                  searchSourceBuilder.sort(new FieldSortBuilder(field).order(order));
              }
          }
  
          // Generate the actual request to send to ES.
          SearchRequest searchRequest = new SearchRequest(indexName);
          searchRequest.types(docType);
          searchRequest.source(searchSourceBuilder);
  
          SearchResponse response = elasticSearchClient.search(searchRequest);
  
          List<String> result = new LinkedList<>();
          response.getHits().forEach(hit -> result.add(hit.getId()));
          long count = response.getHits().getTotalHits();
          return new SearchResult<>(count, result);
      }
docs: Tries to find object ids for a given query in an index.
  
  @param indexName The name of the index.
  @param queryBuilder The query to use for searching.
  @param start The start to use.
  @param size The total return size.
  @param sortOptions A list of string options to sort in the form VALUE:ORDER; where ORDER is optional and can be either ASC OR DESC.
  @param docType The document type to searchObjectIdsViaExpression for.
  
  @return The SearchResults which includes the count and IDs that were found.
  @throws IOException If we cannot communicate with ES.