ES 0.20.0 hangs regularly

hi,
i have running cluster of 3 nodes (ES 0.20.0) and once a day or 2, it hangs
for me.. by hang, i mean curl command for health check or get or search
hangs forever. the log files don't have any clue on this.

what can i do to debug this further? will upgrading to lucene 4 based
versions help?

thanks

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