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search: Only drop index if assigned shard has indexed

Administrator requested to merge core/sharding-v1 into master

Created by: keegancsmith

In the event of rebalancing this will allow us to wait until the new node has indexed a repository before dropping it. When a node asks for the list of repositories to index, we return the union of two sets:

  • The set of all repositories assigned to it via consistent hashing
  • Any repository it has already indexed which is not yet indexed by the node it is assigned. (Rebalancing).

This is as described in v1 of RFC 30.

Part of https://github.com/sourcegraph/sourcegraph/issues/5725

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