Running child query alone and in hasChildQuery method

gistfile1.java

String indexName = "perftestIndex"
String childType = "child"
String parentType = "parent"
QueryStringQueryBuilder childQuery = QueryBuilders.queryString("value:1");

//When I run this query on and continuously updated index it runs very fast and returns at most in 5 msecs
SearchRequest searchRequest = new SearchRequest();
SearchSourceBuilder ssb = new SearchSourceBuilder();
ssb.query(childQuery);
searchRequest.source(ssb);
searchRequest.indices(new String[]{indexName});
searchRequest.types(childType);
client.search(searchRequest)


//When I use childQuery in hasChildQuery or hasChildFilter it gives timeout exceptions
QueryStringQueryBuilder hasChildQuery = QueryBuilders.hasChildQuery(childType, childQuery);

searchRequest = new SearchRequest();
ssb = new SearchSourceBuilder();
ssb.query(hasChildQuery);
searchRequest.source(ssb);
searchRequest.indices(new String[]{indexName});
searchRequest.types(parentType);
client.search(searchRequest)