anchor.diff:  // CONSOLE
   // TEST[continued]
   
  -*NOTE:* versioning is completely real time, and is not affected by the
  +*NOTE:* Versioning is completely real time, and is not affected by the
   near real time aspects of search operations. If no version is provided,
   then the operation is executed without any version checks.
   
  
positive.code: also supports other types for specific use cases. Here is an overview of
  the different version types and their semantics.
  
  `internal`:: only index the document if the given version is identical to the version
  of the stored document.
  deprecated[6.7.0, Please use `if_seq_no` & `if_primary_term` instead. See <<optimistic-concurrency-control>> for more details.]
  
  
  `external` or `external_gt`:: only index the document if the given version is strictly higher
  than the version of the stored document *or* if there is no existing document. The given
  version will be used as the new version and will be stored with the new document. The supplied
  version must be a non-negative long number.
  
  `external_gte`:: only index the document if the given version is *equal* or higher
  than the version of the stored document. If there is no existing document
  the operation will succeed as well. The given version will be used as the new version
  and will be stored with the new document. The supplied version must be a non-negative long number.
  
negative.code: --------------------------------------------------
  // TESTRESPONSE[s/"successful" : 2/"successful" : 1/]
  
  The `_shards` header provides information about the replication process of the index operation:
  
  `total`:: Indicates how many shard copies (primary and replica shards) the index operation should be executed on.
  `successful`:: Indicates the number of shard copies the index operation succeeded on.
  `failed`:: An array that contains replication-related errors in the case an index operation failed on a replica shard.
  
  The index operation is successful in the case `successful` is at least 1.
  
  