ElasticSearch Filter Cache Size is too low and a lot field Eviction

Elastic Stack Elasticsearch
1

We have ES(1.7.3) cluster with 18 nodes. We have the following settings for each node:

ES_HEAP_SIZE=90G
indices.fielddata.cache.size=75%

When we looked at the monitoring metrics(Elastic HQ), We have "Field Size": ~25GB while the "Filter Cache Size":~5GB. Should the "Filter Cache Size" be 90Gx75%=67.5G?

Under this settings, we are experiencing very slow "Search-Fetch" and "Refresh". And "Field Evictions" are sky high, e.g. some of the nodes have >1000 Field Evictions.

Is there any reasons the filter cache size is not shown as expected? and are we doing something wrong with the configurations?

2

That's way beyond what we recommend as best practises. Why is it so big?

3

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