Merge pull request #16665 from joynes/patch-1

Typo

docs/reference/indices/create-index.asciidoc

@@ -110,7 +110,7 @@ curl -XPUT localhost:9200/test -d '{
 === Creation Date
 
 When an index is created, a timestamp is stored in the index metadata for the creation date.  By 
-default this it is automatically generated but it can also be specified using the 
+default this is automatically generated but it can also be specified using the 
 `creation_date` parameter on the create index API:
 
 [source,js]