[DOCS] Removes beta label from index sorting (#34327)

docs/reference/index-modules/index-sorting.asciidoc

@@ -1,8 +1,6 @@
 [[index-modules-index-sorting]]
 == Index Sorting
 
-beta[]
-
 When creating a new index in Elasticsearch it is possible to configure how the Segments
 inside each Shard will be sorted. By default Lucene does not apply any sort.
 The `index.sort.*` settings define which fields should be used to sort the documents inside each Segment.