There are 6 indexes with 612 shards (each index 102 shards) and about
3,000,000,000 documents (1500 GB) clustered on 14 nodes.
During the last 2 days there were neither search nor indexing request
against ES. Today I checked the ES status, it was red and 4 nodes were not
accessible and I had to reset them.
The server hang occurs frequently (at least one server a day).
max_open_files is 1048555 (I see the number in the logs, during the ES
startup) and also bootstrap.mlockall: true configured in the .yml files.
ES version is 20.5
Linux version: 2.6.32-5-amd64 (Debian 2.6.32-46)
32g total ram (12g assigned to ES)
Thanks for your helps,
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