Cache the post mapping version #2445
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Description of the Change
This PR caches the detected Posts mapping version for a day. This way, we don't send get_mapping calls on every request but we are still able to detect if the ES server was upgraded in a timely manner. People wanting to change that period can do that via the new
ep_post_mapping_version_cache_expirationfilter.Applicable Issues
Closes #2432
Changelog Entry
Changed: Cache the detect posts mapping version, avoiding get_mapping calls in all admin requests.