When you are sure that old indexes are no longer needed, you can delete them from Cloud Datastore using the datastore cleanup-indexes <https://cloud.google.com/sdk/gcloud/reference/datastore/cleanup-indexes> command. This command deletes all indexes for the production Cloud Datastore instance that are not mentioned in the local version of index.yaml. For more detail, you may read the "Deleting unused indexes" sub-chapter <https://cloud.google.com/datastore/docs/tools/indexconfig#Datastore_Deleting_unused_indexes> of the "Index Configuration" online document.
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