Questions about file cache

Elastic Stack Elasticsearch
1

Greetings,

Right now I have this problem of request timeout which seldom happens but would like to figure out what cause it.
Came across File Cache on ElasticSearch while doing some research

Have few questions in my mind right now:

  1. Can file cache be disabled? Is it the same command as PUT /my_index/_settings { "index.requests.cache.enable": true }?

  2. For testing, how to clear file cache? Is it the same as POST /twitter/_cache/clear?

A side question. Comparing Lucene Syntax and ElasticSearch Query String, which one is faster?

Thanks in advance!

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