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Optimize completion suggester index creation
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Description

The current strategy to create the completion suggester index is to create a new one and then delete the previous one. Unfortunately index creation is costly operation which causes shards to re-balance. It'd be better to reuse the same index, especially for small wikis.

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Change 260041 had a related patch set uploaded (by DCausse):
Optimize suggester index creation for small wikis

https://gerrit.wikimedia.org/r/260041

Change 260041 merged by jenkins-bot:
Optimize suggester index creation for small wikis

https://gerrit.wikimedia.org/r/260041