How does reallocation work?

As we know, ES cluster will do reallocation when nodes add/remove. How does reallocation work? During reallocation, can we still query data and inject new data? Will query or new injection block the reallocation?

Will query or new injection block the reallocation?

No. It will work as you would expect.

The new version of the shard will be marked as available only when ready.

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