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implicitlyCreateIndex defaults to true and when set to false, will not create new indexes while running the shardCollection command.

enforceUniquenessCheck defaults to true and when set to false, ignores uniqueness property when validating indexes for shardCollection.

Regardless of both settings, shardCollection should still return an error if there are no index that is compatible with the new shard key pattern.

causes

SERVER-64519 Critical section reason for create collection is multiversion incompatible

SERVER-64580 Step downs while sharding a collection in mixed binaries shards might crash the old binary

is documented by

DOCS-15173 Investigate changes in SERVER-63732: Add new implicitlyCreateIndex and enforceUniquenessCheck to shardCollection command

related to

SERVER-64573 Make implicitlyCreateIndex and enforceUniquenessCheck fields optional

SERVER-64142 Add new enforceUniqueness to refineCollectionShardKey command