Add status button to re-install the Elastic index

[mworrell]

If a document is inserted without first creating the index and installing the mappings, then the default mappings are used.

These default mappings are wrong, especially for related objects.

If such a wrong index exists, or if mappings are changed, then we need a simple method to re-install the index with the new mappings.

Proposal is to add a button to /admin/status to drop the index, re-create the index, and start a re-pivot of all resources.

[mworrell]

An alternative is to add an admin status page where we can see:

• The index being used
• The mappings
• Number of documents
• Fetch document button - to check what is stored
• Simple GET requests to perform checks