--- a/elasticsearch.rst	Thu Jan 10 14:00:04 2019 +0200
+++ b/elasticsearch.rst	Thu Jan 10 14:13:45 2019 +0200
@@ -211,10 +211,20 @@
   Tune for search speed.
 https://www.elastic.co/blog/how-many-shards-should-i-have-in-my-elasticsearch-cluster
   How many shards should I have in my Elasticsearch cluster?
+https://www.elastic.co/guide/en/elasticsearch/reference/master/heap-size.html
+  Setting the heap size.
+
+Storage requirements
+====================
+
+https://www.elastic.co/blog/elasticsearch-storage-the-true-story
+  The true story behind Elasticsearch storage requirements (2015).
+https://www.elastic.co/blog/elasticsearch-storage-the-true-story-2.0
+  Part 2.0: The true story behind Elasticsearch storage requirements (2015).
+https://www.elastic.co/blog/minimize-index-storage-size-elasticsearch-6-0
+  Space Saving Improvements in Elasticsearch 6.0 (2017).
 https://www.elastic.co/blog/filebeat-modiles-access-logs-and-elasticsearch-storage-requirements
   Filebeat modules, access logs and Elasticsearch storage requirements.
-https://www.elastic.co/guide/en/elasticsearch/reference/master/heap-size.html
-  Setting the heap size.
 
 JSON search syntax
 ==================