fix another typo in the docs
@@ -58,7 +58,7 @@ POST /cluster_one:twitter,twitter/tweet/_search
Search results are disambiguated the same way as the indices are disambiguated in the request. Even if index names are
identical these indices will be treated as different indices when results are merged. All results retrieved from a remote index
-will be prefixed with it's remote clusters name:
+will be prefixed with their remote cluster name:
[source,js]
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