I have a server with 48GB memory and set ES_HEAP_SIZE to 32GB.

1. In this case I want to know, where to set indices.fielddata.cache.size
and indices.fielddata.cache.expire and what is the proper value for the two
configurations in my case.

currently I set them in the elasticsearch.yml:

indices.fielddata.cache.size: 16GB
indices.fielddata.cache.expire: 1m

2. I also noted another two settings: indices.cache.filter.size and
indices.cache.filter.expire, I want to know what's the difference between
them and the default value of them.

Thanks.

-- 
不学习,不知道

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