[elasticsearch] Revise documentation and add missing changelog entry

CHANGELOG.develop

@@ -332,6 +332,7 @@ sane way, here is the complete list of changed key bindings
 - crystal (thanks to Sylvain Benner)
 - dart (thanks to Bruno Tavares)
 - dhall (thanks to Colin Woodbury)
+- elasticsearch (thanks to Jean Rigotti)
 - factor (thanks to timor)
 - forth (thanks to Tim Jaeger)
 - gpu (thanks to Evan Klitzke)

layers/+tools/elasticsearch/README.org

@@ -1,19 +1,22 @@
 #+TITLE: elasticsearch layer
 
+#+TAGS: dsl|layer|programming
+
 [[file:img/elasticsearch.png]]
 
-* Table of Contents                                       :TOC_4_gh:noexport:
+* Table of Contents                                       :TOC_5_gh:noexport:
 - [[#description][Description]]
   - [[#features][Features:]]
 - [[#install][Install]]
 - [[#key-bindings][Key bindings]]
 
 * Description
-This layer adds Elasticsearch queries support to Spacemacs.
+This layer adds Elasticsearch query and monitoring support to Spacemacs.
 
 ** Features:
-  - Autocompletion for Elasticsearch Query DSL
-  - Support for Org-Babel
+- Autocompletion for Elasticsearch Query DSL
+- Support for Org-Babel
+- Support for an Elasticsearch Command Center to monitor a cluster
 
 * Install
 To use this configuration layer, add it to your =~/.spacemacs=. You will need to

layers/+tools/elasticsearch/packages.el

@@ -1,6 +1,6 @@
 ;;; packages.el --- elasticsearch layer packages file for Spacemacs.
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Jean Rigotti <gmgotti@pm.me>
 ;; URL: https://github.com/syl20bnr/spacemacs