and that too, on an intermittent basis - sometimes it returns results while sometimes it does not. There is no more descriptive information available in the server log.
Yes, I did not have a full stack trace for that particular exception. I faced a new exception after posting this question and the trace is as below:
[2016-02-01 12:42:28,773][DEBUG][action.search.type ] [elastic71] failed to reduce search org.elasticsearch.action.search.ReduceSearchPhaseException: Failed to execute phase [fetch], [reduce] at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction$2.onFailure(TransportSearchQueryThenFetchAction.java:159) at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:41) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassCastException
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