Fixed JSON in fielddata docs
Core: The ignore_unavailable=true setting also ignores indices that are closed.

Closes #6471
Closes #6475
[TEST] Improve reproducibility of mappings propagation delays related issues.
Add RedistributingCircuitBreakerService

Also adds a breaker for request BigArrays
Remove BigArray buffering, bubble breaker-checking flag through pipeline
Fix an infinite recursion in BigArrays
Fix BigArraysTests to use breaker, remove unneeded setting in BigArrays
javadocs
MockBigArrays should use a real breaker, not the DummyCircuitBreakerService
Add a test for tripping the request breaker