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Operating System:
ALL
Steps To Reproduce:
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create a sharded collection on 2 shards with the key {x:"hashed"}

populate the collection with some dummy data

connect directly to the shard 2 and drop the shard key index

try moving chunks from shard 2 to shard 1

observe migrations failing without a specific error
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create a sharded collection on 2 shards with the key {x:"hashed"} populate the collection with some dummy data connect directly to the shard 2 and drop the shard key index try moving chunks from shard 2 to shard 1 observe migrations failing without a specific error

If a particular shard misses the shard key index, any migrations from it will fail, which is expected.

What is unexpected, is that no explicit error is logged even with loglevel 1, basically leaving the operator guessing what's wrong.

duplicates

SERVER-14080 Have migration result reported in the changelog correctly