Such query 'curl localhost:9200/_stats' returns an 500 error

I have a question regarding statistics which can be shown using such query: 'curl localhost:9200/_stats'
It should return high level aggregation and index level stats for all indices. In my case it returns an error:

Worth of mention is that all specific stats are working properly e.g. curl http://localhost:9200/_stats/indices shows proper data.
There is only problem with all statistics.I am using 1.5.1 version.


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That's very unusual, is there anything in your logs at the time of the request?

Unfortunatelly there is nothing in the log which could lead me to something... I hoped that someone saw such error before.