Add elasticsearch documentation.

elasticsearch/README-short.txt

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+Elasticsearch is a powerful open source search and analytics engine that makes data easy to explore.

elasticsearch/README.md

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+# Supported tags and respective `Dockerfile` links
+
+
+
+For more information about this image and its history, please see the [relevant
+manifest file
+(`library/elasticsearch`)](https://github.com/docker-library/official-images/blob/master/library/elasticsearch)
+in the [`docker-library/official-images` GitHub
+repo](https://github.com/docker-library/official-images).
+
+# What is Elasticsearch?
+
+Elasticsearch is a search server based on Lucene. It provides a distributed,
+multitenant-capable full-text search engine with a RESTful web interface and
+schema-free JSON documents.
+
+> [wikipedia.org/wiki/Elasticsearch](https://en.wikipedia.org/wiki/Elasticsearch)
+
+![logo](https://raw.githubusercontent.com/docker-library/docs/master/elasticsearch/logo.png)
+
+# How to use this image
+
+You can run the default `elasticsearch` command simply:
+
+    docker run -it --rm elasticsearch
+
+You can also pass in additional flags to `elasticsearch`:
+
+    docker run -it --rm elasticsearch -Des.node.name="TestNode"
+
+This image comes with a default set of configuration files for `elasticsearch`,
+but if you want to provide your own set of configuration files, you can do so
+via a volume bindmount.
+
+    docker run -it --rm -v "$PWD/config":/usr/share/elasticsearch/config elasticsearch
+
+# License
+
+View license information for [Elasticsearch](http://www.elasticsearch.org/guide/en/elasticsearch/hadoop/current/license.html) software contained in this image.
+
+# Supported Docker versions
+
+This image is officially supported on Docker version 1.4.1.
+
+Support for older versions (down to 1.0) is provided on a best-effort basis.
+
+# User Feedback
+
+## Issues
+
+If you have any problems with or questions about this image, please contact us
+ through a [GitHub issue](https://github.com/docker-library/elasticsearch/issues).
+
+You can also reach many of the official image maintainers via the
+`#docker-library` IRC channel on [Freenode](https://freenode.net).
+
+## Contributing
+
+You are invited to contribute new features, fixes, or updates, large or small;
+we are always thrilled to receive pull requests, and do our best to process them
+as fast as we can.
+
+Before you start to code, we recommend discussing your plans 
+through a [GitHub issue](https://github.com/docker-library/elasticsearch/issues), especially for more ambitious
+contributions. This gives other contributors a chance to point you in the right
+direction, give you feedback on your design, and help you find out if someone
+else is working on the same thing.

elasticsearch/content.md

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+# What is Elasticsearch?
+
+Elasticsearch is a search server based on Lucene. It provides a distributed,
+multitenant-capable full-text search engine with a RESTful web interface and
+schema-free JSON documents.
+
+> [wikipedia.org/wiki/Elasticsearch](https://en.wikipedia.org/wiki/Elasticsearch)
+
+%%LOGO%%
+
+# How to use this image
+
+You can run the default `elasticsearch` command simply:
+
+    docker run -it --rm elasticsearch
+
+You can also pass in additional flags to `elasticsearch`:
+
+    docker run -it --rm elasticsearch -Des.node.name="TestNode"
+
+This image comes with a default set of configuration files for `elasticsearch`,
+but if you want to provide your own set of configuration files, you can do so
+via a volume bindmount.
+
+    docker run -it --rm -v "$PWD/config":/usr/share/elasticsearch/config elasticsearch

elasticsearch/license.md

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+View license information for [Elasticsearch](http://www.elasticsearch.org/guide/en/elasticsearch/hadoop/current/license.html) software contained in this image.
+