[ElasticSearch] QueryBuild vs. String: ElasticsearchParseException[Failed to derive xcontent from...

I had a problem while writing tests for use the new setFetchSource feature of ES 1.1. After some test, research and thinking (try and error). I finally realised that the problem rises when you are using a plain string query instead of a QueryBuilder.


org.elasticsearch.action.search.SearchPhaseExecutionException: Failed to execute phase [query_fetch], all shards failed; shardFailures {[KMpFYBpxRECgm3gJC_1-uw][content][0]: SearchParseException[[content][0]: from[-1],size[10]: Parse Failure [Failed to parse source [{"size":10,"query_binary":"VGVzdHRleHQ=","_source":{"includes":["CONTENTID","URL"],"excludes":["CONTENT"]},"fields":["CONTENTID","URL"]}]]]; nested: ElasticsearchParseException[Failed to derive xcontent from (offset=0, length=8): [84, 101, 115, 116, 116, 101, 120, 116]]; }
    at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.onFirstPhaseResult(TransportSearchTypeAction.java:272)
    at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$3.onFailure(TransportSearchTypeAction.java:224)
    at org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteFetch(SearchServiceTransportAction.java:307)
    at org.elasticsearch.action.search.type.TransportSearchQueryAndFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryAndFetchAction.java:71)
    at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:216)
    at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:203)
    at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:186)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)


Makes sense, since the error says: "failed to derive xcontent from (offset". However, for a not native english speaker, took some time. Just change:

String query="";
        
SearchResponse response = client.prepareSearch(CONTENT_INDEX).setFetchSource(includes, excludes).setQuery(query).addFields(includes)
                    .setSize(10).execute().actionGet();

To:

String query="";

QueryStringQueryBuilder qb = QueryBuilders.queryString(query);

SearchResponse response = client.prepareSearch(CONTENT_INDEX).setFetchSource(includes, excludes).setQuery(qb).addFields(includes)
                    .setSize(10).execute().actionGet();