Right now if an insert is to "system.indexes" it calls performCreateIndexes before the check for retryability for regular inserts. This means a retry of a successful insert to that collection will not be skipped and will call createIndexes again. We should either add retry checking to performCreateIndexes or uassert if an insert to "system.indexes" contains a txnNumber since the operation can't be retried.

Failing retryable_writes_jscore_passthrough tests:

• batch_write_command_insert.js