Allow for elasticsearch.requestHeaders to be set to null

config/kibana.yml

@@ -61,7 +61,9 @@
 # must be a positive integer.
 # elasticsearch.requestTimeout: 30000
 
-# List of Kibana client-side headers to send to Elasticsearch
+# List of Kibana client-side headers to send to Elasticsearch. To send *no* client-side
+# headers, set this value to null, not []. Setting it to [] will send the default list
+# of headers.
 # elasticsearch.requestHeaders: [ authorization ]
 
 # Time in milliseconds for Elasticsearch to wait for responses from shards. Set to 0 to disable.

docs/kibana-yml.asciidoc

@@ -30,6 +30,7 @@ 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.requestHeaders:`:: *Default: `[ 'authorization' ]`* List of Kibana client-side headers to send to Elasticsearch.
+To send *no* client-side headers, set this value to null, not []. Setting it to [] will send the default list of headers.
 `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 

docs/settings.asciidoc

@@ -376,7 +376,7 @@ 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.
+`elasticsearch.requestHeaders:` added[5.0]:: List of Kibana client-side headers to send to Elasticsearch. To send *no* client-side headers, set this value to null, not []. Setting it to [] will send the default list of headers.
 +
 *default*: `[ 'authorization' ]`
 

src/plugins/elasticsearch/index.js

@@ -22,7 +22,7 @@ module.exports = function ({ Plugin }) {
         password: string(),
         shardTimeout: number().default(0),
         requestTimeout: number().default(30000),
-        requestHeaders: array().items(string()).single().default(DEFAULT_REQUEST_HEADERS),
+        requestHeaders: array().items().single().default(DEFAULT_REQUEST_HEADERS),
         pingTimeout: number().default(ref('requestTimeout')),
         startupTimeout: number().default(5000),
         ssl: object({