Consistency for the win

- The result object contains also the metadata about the request
- The events emits the same object of the API response
- The errors, where possible, exposes the APi response object under the
meta key

lib/errors.js

@@ -27,31 +27,32 @@ class ElasticsearchClientError extends Error {
 }
 
 class TimeoutError extends ElasticsearchClientError {
-  constructor (message, request) {
+  constructor (message, meta) {
     super(message)
     Error.captureStackTrace(this, TimeoutError)
     this.name = 'TimeoutError'
     this.message = message || 'Timeout Error'
-    this.request = request
+    this.meta = meta
   }
 }
 
 class ConnectionError extends ElasticsearchClientError {
-  constructor (message, request) {
+  constructor (message, meta) {
     super(message)
     Error.captureStackTrace(this, ConnectionError)
     this.name = 'ConnectionError'
     this.message = message || 'Connection Error'
-    this.request = request
+    this.meta = meta
   }
 }
 
 class NoLivingConnectionsError extends ElasticsearchClientError {
-  constructor (message) {
+  constructor (message, meta) {
     super(message)
     Error.captureStackTrace(this, NoLivingConnectionsError)
     this.name = 'NoLivingConnectionsError'
     this.message = message || 'No Living Connections Error'
+    this.meta = meta
   }
 }
 
@@ -83,16 +84,27 @@ class ConfigurationError extends ElasticsearchClientError {
 }
 
 class ResponseError extends ElasticsearchClientError {
-  constructor ({ body, statusCode, headers }) {
+  constructor (meta) {
     super('Response Error')
     Error.captureStackTrace(this, ResponseError)
     this.name = 'ResponseError'
-    this.message = (body && body.error && body.error.type) || 'Response Error'
-    this.body = body
-    this.statusCode = body && typeof body.status === 'number'
-      ? body.status
-      : statusCode
-    this.headers = headers
+    this.message = (meta.body && meta.body.error && meta.body.error.type) || 'Response Error'
+    this.meta = meta
+  }
+
+  get body () {
+    return this.meta.body
+  }
+
+  get statusCode () {
+    if (this.meta.body && typeof this.meta.body.status === 'number') {
+      return this.meta.body.status
+    }
+    return this.meta.statusCode
+  }
+
+  get headers () {
+    return this.meta.headers
   }
 }