Bump elasticsearch client

Backports PR #9446

**Commit 1:**
Bump elasticsearch client

* Original sha: c007b55
* Authored by Jonathan Budzenski <jon@jbudz.me> on 2016-12-12T18:51:41Z

**Commit 2:**
Bump elasticsearch version in tests entry template to master

* Original sha: 2419fe3
* Authored by Jonathan Budzenski <jon@jbudz.me> on 2016-12-12T19:13:27Z

package.json

@@ -104,8 +104,8 @@
     "d3": "3.5.6",
     "d3-cloud": "1.2.1",
     "dragula": "3.7.0",
-    "elasticsearch": "12.0.0-rc5",
-    "elasticsearch-browser": "12.0.0-rc5",
+    "elasticsearch": "12.1.2",
+    "elasticsearch-browser": "12.1.2",
     "encode-uri-query": "1.0.0",
     "even-better": "7.0.2",
     "expiry-js": "0.1.7",

src/core_plugins/tests_bundle/tests_entry_template.js

@@ -26,7 +26,7 @@ window.__KBN__ = {
   vars: {
     kbnIndex: '.kibana',
     esShardTimeout: 1500,
-    esApiVersion: '2.0',
+    esApiVersion: '5.x',
     esRequestTimeout: '300000',
     tilemap: {
       url: 'https://tiles.elastic.co/v1/default/{z}/{x}/{y}.png?my_app_name=kibana&my_app_version=1.2.3&elastic_tile_service_tos=agree',