Copy 1.12.4 release notes to master

CHANGELOG.txt

@@ -229,6 +229,12 @@ Changelog
  * Fix: API listing views no longer fail when no site records are defined (Karl Hobley)
 
 
+1.12.4 (IN DEVELOPMENT)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+* Fix: Fix support of `ATOMIC_REBUILD` for projects with Elasticsearch client >=1.7.0 (Mikalai Radchuk)
+
+
 1.12.3 (17.11.2017)
 ~~~~~~~~~~~~~~~~~~~
 

docs/releases/1.12.4.rst

@@ -0,0 +1,16 @@
+=============================================
+Wagtail 1.12.4 release notes - IN DEVELOPMENT
+=============================================
+
+.. contents::
+    :local:
+    :depth: 1
+
+
+What's new
+==========
+
+Bug fixes
+~~~~~~~~~
+
+* Fix support of ``ATOMIC_REBUILD`` for projects with Elasticsearch client ``>=1.7.0`` (Mikalai Radchuk)

docs/releases/index.rst

@@ -12,6 +12,7 @@ Release notes
    2.0
    1.13.1
    1.13
+   1.12.4
    1.12.3
    1.12.2
    1.12.1