Consider I'm having two indices namely twitter1, twitter2.
String indexpattern = "twitter*" ClusterHealthRequest request = new ClusterHealthRequest(indexpattern); ClusterHealthResponse healthResponse = client.cluster().health(request, RequestOptions.DEFAULT);
Here healthResponse.getIndices().entrySet() returns twitter1 and twitter2.
When indexpattern = "twitter1" the healthResponse.getIndices().entrySet() returns twitter1. Thats fine.
But when indexpattern = "twitter" it throws an exception saying java.io.IOException: listener timeout after waiting for  ms after 30 seconds, instead of returning empty set.
Is that normal to throw exception when indices in the cluster doesn't match the pattern?
NOTE: I'm in elasticsearch and elasticsearch-rest-high-level-client version 6.4.0.