Add support for running Elasticsearch as a service on Windows through service.bat and Apache Commons Daemon.
The ZIP file contains 3 new exe files:
elasticsearch-service-x64.exe - service wrapper for 64-bit JVMs
elasticsearch-service-x86.exe - service wrapper for 32-bit JVMs
elasticsearch-service-mgr.exe - service manager (works with both 62 and 32 wrappers)

plus a new .bat file which is the entry point called service.bat

Simply running service.bat gives information on its usage:

> service.bat
Usage: service.bat install|remove|start|stop|manager [SERVICE_ID]

> service install
Installing service      :  'elasticsearch-service-x64'
Using JAVA_HOME (64-bit):  c:\jvm\jdk1.7
The service 'elasticsearch-service-x64' has been installed.

> service start
The service 'elasticsearch-service-x64' has been started

> service stop
The service 'elasticsearch-service-x64' has been stopped

> service remove
The service 'elasticsearch-service-x64' has been removed

In most cases, one simply installs the service and potentially does extra customizations through the service manager

> service install
> service manager

Once installed, Elasticsearch acts as any other Windows service so can be started, stopped, have different Startup types, etc...

Note that service.bat relies on the same conventions as elasticsearch.bat and the debian package - meaning the environment variables will be used (if present) during the install to set certain options.

P.S. The service.bat automatically does detection of the architecture (64 vs 32) of the target JVM detected through JAVA_HOME variable. If a certain JVM is desired, make sure that JAVA_HOME points to it.