Merge pull request #15274 from murnieza/patch-1

[Doc] Redundant indefinite article removed

docs/reference/search/suggesters/completion-suggest.asciidoc

@@ -92,7 +92,7 @@ PUT music/song/1?refresh=true
 The following parameters are supported:
 
 `input`::
-    The input to store, this can be a an array of strings or just
+    The input to store, this can be an array of strings or just
     a string. This field is mandatory.
 
 `weight`::