Remove the erasure of the elasticsearch rotate

As we have started with fresh boxes this no longer needs to be here.
Include estools

The deprecated elasticsearch module used to include these tools. We
still need them to rotate out our indices so we should install them
ourselves.

This relies on the following PR being merged:

https://github.com/alphagov/estools/pull/7

As the old version of pyes used by the tools had issues.
Roll elasticsearch logs based on size

log4j, the underlying elasticsearch logging library, can't roll logs
daily and remove some after a certain date. Using a rolling file
appender and limited on the size of logs gives us both the ability to
remove and ensures that our logs do not blow up our disk if something
gets over excited.