Index pattern creation docs - add necessary elasticsearch privleges (e…

…lastic#88133) (elastic#88349)

* add privs to index pattern creation docs

docs/management/index-patterns.asciidoc

@@ -19,8 +19,9 @@ You’ll learn how to:
 [[index-patterns-read-only-access]]
 === Before you begin
 
-* To access *Index Patterns*, you must have the {kib} privilege
-`Index Pattern Management`.  To add the privilege, open the main menu, then click *Stack Management > Roles*.
+* To access the *Index Patterns* view, you must have the {kib} privilege
+`Index Pattern Management`.  To create an index pattern, you must have the {es} privilege
+`view_index_metadata`. To add the privileges, open the main menu, then click *Stack Management > Roles*.
 
 * If a read-only indicator appears in {kib}, you have insufficient privileges
 to create or save index patterns. The buttons to create new index patterns or