Improve wording

"... as less as possible" -> "... as little as possible"

docs/reference/query-dsl/has-child-query.asciidoc

@@ -27,9 +27,9 @@ Note that the `has_child` is a slow query compared to other queries in the
 query dsl due to the fact that it performs a join. The performance degrades
 as the number of matching child documents pointing to unique parent documents
 increases. If you care about query performance you should not use this query.
-However if you do happen to use this query then use it as less as possible. Each
-`has_child` query that gets added to a search request can increase query time
-significantly.
+However if you do happen to use this query then use it as little as possible.
+Each `has_child` query that gets added to a search request can increase query
+time significantly.
 
 [float]
 ==== Scoring capabilities