Update search.asciidoc
[DOCS] Corrected typo - singe to single.
@@ -70,7 +70,7 @@ to reject search requests that hit too many shards.
The search's `max_concurrent_shard_requests` request parameter can be used to control
the maximum number of concurrent shard requests the search API will execute for this request.
-This parameter should be used to protect a singe request from overloading a cluster ie. a default
+This parameter should be used to protect a single request from overloading a cluster ie. a default
request will hit all indices in a cluster which could cause shard request rejections if the
number of shards per node is high. This default is based on the number of data nodes in
the cluster but at most `256`.
