Updated docs

docs/index.asciidoc

@@ -8,6 +8,7 @@ The official Node.js client for Elasticsearch.
 * Configurable, automatic discovery of cluster nodes.
 * Persistent, Keep-Alive connections.
 * Load balancing (with pluggable selection strategy) across all available nodes.
+* TypeScript support out of the box.
 
 == Install
 [source,sh]
@@ -46,3 +47,5 @@ client.search({
 * TypeScript support
 * Extend the client
 * Breaking changes from old client
+* Authentication
+* Child client

docs/usage.asciidoc

@@ -30,13 +30,16 @@ The returned value of every API call is formed as follows:
   body: object | boolean
   statusCode: number
   headers: object
-  warnings: [string]
+  warnings: [string],
+  meta: object
 }
 ----
 
 NOTE: The body will be a boolean value when using `HEAD` APIs.
 
-The above valiue will be returned even if there is an error during the execution of the request, this means that you can safely use the https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment[destructuring assignment].
+The above value will be returned even if there is an error during the execution of the request, this means that you can safely use the https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment[destructuring assignment].
+
+The `meta` key contains all the information regarding the request, such as attempt, options, and the connection that has been used.
 
 [source,js]
 ----