Support index deletes with an index pattern

[fmassot]

elasticsearch muti target doc

elastic index delete API

This feature should be first implemented in the elasticsearch compatible API (under _elastic).

Additional notes:

• The delete with index patterns containing wildcards should not be enabled by default. It is ok to give a list of index IDs.
• We should return an elasticsearch-like response.

[matthewfollegot]

👋 Hello @fmassot, I was looking into potentially picking this up, what's the status with this issue?

[fmassot]

@matthewfollegot cool! We have a small time constraint on it; if you can't work on it in the following days (some work was also done on it in a PR), we can find you another issue.

[matthewfollegot]

I started on this and should be able to make more progress tomorrow.
Just a question for you in the meantime: would you prefer this to be a separate endpoint than the DELETE "/indexes/{index_id}" endpoint? I think it would be cleaner than separating it out into its own, but this would make this endpoint slower because we'd have to submit a search query for each pattern to get the index_id. An improvement would be to only search if it contains certain characters (e.g. *, .), but we'd still have to search over patterns that include these.

[esatterwhite]

I think this should support at least the ignore_unavailable query param.

if ignore_unavailable is set to true it shouldn't be considered a success if the index in question is missing rather than 404.