Backport PR #7212

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**Commit 1:**
Incorrect default `elasticsearch.requestTimeout`

Documentation says it's 300,000 ms, which is 5 minutes.
The default is actually 30 seconds, or 30,000 ms.

* Original sha: 7ac9f93
* Authored by awochna <awynter@tidyfoxdev.com> on 2016-05-10T17:29:04Z
* Committed by Alex Wynter <awochna@email.arizona.edu> on 2016-05-16T16:44:41Z

docs/kibana-yml.asciidoc

@@ -27,7 +27,7 @@ authority for your Elasticsearch instance.
 to `false`.
 `elasticsearch.pingTimeout:`:: *Default: the value of the `elasticsearch.requestTimeout` setting* Time in milliseconds to
 wait for Elasticsearch to respond to pings.
-`elasticsearch.requestTimeout:`:: *Default: 300000* Time in milliseconds to wait for responses from the back end or
+`elasticsearch.requestTimeout:`:: *Default: 30000* Time in milliseconds to wait for responses from the back end or
 Elasticsearch. This value must be a positive integer.
 `elasticsearch.requestHeadersWhitelist:`:: *Default: `[ 'authorization' ]`* List of Kibana client-side headers to send to Elasticsearch.
 To send *no* client-side headers, set this value to [] (an empty list).