Add license

Non-functional change: Add Apache 2.0 license

ILM support

With filebeat 7.x, ILM is set to auto by default, which means if ILM enabled on elasticsearch then filebeat will try use it. If the user that connects to elasticsearch doesn't have the required permissions, you will get 403 errors.

Added all the ILM configs tro let you configure this behaviour.

Tweak the Readme and update CHANGELOG format to work on the forge

Bug fix to filebeat modules

This release is a small tweak to how we handle modules. Previously we assumed the modules would be in pristine condition, ie either enabled or disabled. BUT if you delete the module config, filebeat will error out.

Now we check if the module is either correctly enabled or correctly disabled before asking filebeats to do anything.

v7.x

This release is for users who are running 7.x versions of Filebeat installations. This release utilizes the inputs declaration instead of prospectors - this is classified as a breaking change in the Elastic documentation.

pre-v7.x

This release is for users who are running pre-7.x versions of Filebeat installations. This release utilizes the prospectors declaration instead of inputs - this is classified as a breaking change in the Elastic documentation.