response - elasticsearch randomly not responding to query -

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We use elastic search since a few weeks, and in some indexes separated by month, more than 160 million There are entries (like index_2014_01, index_2014_02, ....).
Occasionally if we send a bulk query request for elastic search nodes for some requests, then there is no response and there is no timeout. There is no chance to reproduce this problem because it is random And at least the reaction time is also done on questions that work in seconds before.
We have successfully started debugging without elastic search transport customer. We found that no response was requested (breakpoint was included in the feedback-listener, request-listener, and failure-listener) - There was no response after the long wait or there was no failure. There is no exception or logout in it, which indicates the problem that there is a message "Disconnected from the node" at a later time. There is no error in the logs from the cluster-node, there is not much load on the elasticships cluster And on our firewall all ports of 9200 to 9400 have been opened.

Our application structure:

Tomcat 7 (Java-7U25) -> Spring-Data-ElasticShirt-1.0.0.m2 -> ElasticWhiteC.1.1.0 ( 1.0.0 with the same issue ----------> Elastic Search (8 nodes) Version 1.0.0 (Java-7U25)

This issue is random And we do not know where it comes from.

Anyone have any ideas?


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