@@ -37,6 +37,7 @@ Original Source: [Free Programming books](http://stackoverflow.com/revisions/392
*[Delphi / Pascal](#delphi--pascal)
*[DTrace](#dtrace)
*[Elasticsearch](#elasticsearch)
*[Elixir](#elixir)
*[Emacs](#emacs)
*[Erlang](#erlang)
*[F#](#f-sharp)
...
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@@ -888,6 +889,12 @@ Original Source: [Free Programming books](http://stackoverflow.com/revisions/392
*[Elasticsearch: The Definitive Guide](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/index.html)([fork it on GH](https://github.com/elasticsearch/elasticsearch-definitive-guide))