Simon Willnauer b2c4c323e1 Allow _shrink to N shards if source shards is a multiple of N (#18699)
Today we allow to shrink to 1 shard but that might not be possible due to
too many document or a single shard doesn't meet the requirements for the index.
The logic can be expanded to N shards if the source index shards is a multiple of N.
This guarantees that there are not hotspots created due to different number of shards
being shrunk into one.
2016-06-07 10:06:41 +02:00
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