Description
Synonyms system index uses auto expand replicas: 0-all. This is different than other system indices, including security, which use 0-1.
This has caused some testing issues in the past (#114641) where we discovered that the problem was related to BwC tests and auto expand replicas (see #115078).
We'd like to understand the tradeoffs for updating auto expand replicas to 0-1 to align the synonyms system index with other system indices in Elasticsearch, and the next steps in terms of implementation (the need to create a new index version vs updating directly).
Description
Synonyms system index uses
auto expand replicas: 0-all. This is different than other system indices, including security, which use0-1.This has caused some testing issues in the past (#114641) where we discovered that the problem was related to BwC tests and auto expand replicas (see #115078).
We'd like to understand the tradeoffs for updating auto expand replicas to 0-1 to align the synonyms system index with other system indices in Elasticsearch, and the next steps in terms of implementation (the need to create a new index version vs updating directly).