Adding elasticsearch.requestHeaders option to kibana.yml and documentation

config/kibana.yml

@@ -61,6 +61,9 @@
 # must be a positive integer.
 # elasticsearch.requestTimeout: 30000
 
+# List of Kibana client-side headers to send to Elasticsearch
+# elasticsearch.requestHeaders: [ ]
+
 # Time in milliseconds for Elasticsearch to wait for responses from shards. Set to 0 to disable.
 # elasticsearch.shardTimeout: 0
 

docs/kibana-yml.asciidoc

@@ -29,7 +29,8 @@ to `false`.
 wait for Elasticsearch to respond to pings.
 `elasticsearch.requestTimeout:`:: *Default: 300000* Time in milliseconds to wait for responses from the back end or 
 Elasticsearch. This value must be a positive integer.
-`elasticsearch.shardTimeout:`:: *Default: 0* Time in milliseconds for Elasticsearch to wait for responses from shards. Set 
+`elasticsearch.requestHeaders:`:: *Default: `[]`* List of Kibana client-side headers to send to Elasticsearch.
+`elasticsearch.shardTimeout:`:: *Default: 0* Time in milliseconds for Elasticsearch to wait for responses from shards. Set
 to 0 to disable.
 `elasticsearch.startupTimeout:`:: *Default: 5000* Time in milliseconds to wait for Elasticsearch at Kibana startup before 
 retrying.

docs/settings.asciidoc

@@ -376,6 +376,10 @@ deprecated[4.2, The names of several Kibana server properties changed in the 4.2
 + 
 *default*: `500000`
 
+`elasticsearch.requestHeaders:` added[5.0]:: List of Kibana client-side headers to send to Elasticsearch.
++
+*default*: `[]`
+
 `elasticsearch.shardTimeout` added[4.2]:: How long Elasticsearch should wait for responses from shards. Set to 0 to disable.
 +
 *alias*: `shard_timeout` deprecated[4.2]