Abacn commented on PR #26273:
URL: https://github.com/apache/beam/pull/26273#issuecomment-1533146357

   If I understood correctly autoSharding uses GroupIntoBatches.withShardedKey. 
It is only supported in Dataflow runner v2. Under runner v1 this flag would 
cause error. Context: #26416 switching the default would break runner v1 user


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