Does in refresh interval data of the entire shards get changed

Elastic Stack Elasticsearch
1

Does in refresh interval data of the entire shards get changed or only the data which has been changed.
Suppose
refresh interval is 1s.
And in if index.requests.cache.enable = true then filter query results will be cached .
So will refresh interval will flush all the data from cache or only the data which has been changed

2

The refresh interval does not relate to the request cache.

From the docs;

A refresh makes all operations performed on an index since the last refresh available for search.

An operation means an index (write), delete or update.

3

Please have a look at this. In Cache Invalidation it is mentioned the caches clear's as soon as the shard gets refreshed
https://www.elastic.co/guide/en/elasticsearch/reference/current/shard-request-cache.html

4

You're right sorry, I forgot that also happened.

So every time a refresh happens, it invalidates that cache.

5

So it invalidate's the entire cache or it invalidate's only the documents which are updated

6

The entire cache.

7

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