Entity content is too long for the configured buffer limit

Issue

• When performing a custom search such as:
  

  IndexSearcherHelperUtil.search(searchContext, query); 

  the following exception is thrown from Elasticsearch and no results are obtained from the search.response attribute.

  2023-03-07 11:53:04.136 ERROR [http-nio-8080-exec-72][ElasticsearchIndexSearcher:164] null
  java.lang.RuntimeException: java.io.IOException: entity content is too long [155989434] for the configured buffer limit [104857600]
  at com.liferay.portal.search.elasticsearch7.internal.search.engine.adapter.search.SearchSearchRequestExecutorImpl.getSearchResponse(SearchSearchRequestExecutorImpl.java:99) ~[?:?]
  {...}
  Caused by: org.apache.http.ContentTooLongException: entity content is too long [155989434] for the configured buffer limit [104857600]

Environment

• Liferay DXP and Elasticsearch.

Resolution

• This happens because Elasticsearch's buffer limit is defined to 100MB as you can see in the implementation, and the results are too big to be stored:

  // default buffer limit is 100MB
  static final int DEFAULT_BUFFER_LIMIT = 100 * 1024 * 1024;

• To avoid getting too many results that may overflow the buffer, please add some filter to the query like groupId, companyId or some other specific attribute of the entity (such as articleId)

Additional Information

• Elasticsearch's HttpAsyncResponseConsumerFactory.java