remove dead code and unused elasticsearch dependency

[andrew-nowak]

What does this change?

This code appears unused, and is the only usage of an outdated elasticsearch dependency (all active elasticsearch queries use elastic4s, which depends on a different and up-to-date elasticsearch dependency)

How should a reviewer test this change?

Does the app compile? If so, all should be fine since this only removes code.

Technically this code might be loaded at runtime? I haven't seen any evidence of this from a (admittedly very brief) look around, I'd be pretty shocked if that was the case. Deploy to TEST to be sure?

How can success be measured?

Who should look at this?

Tested? Documented?

• locally by committer
• locally by Guardian reviewer
• on the Guardian's TEST environment
• relevant documentation added or amended (if needed)

[github-actions]

Deploy build 12892 to TEST

All deployment options

• Deploy build 12892 to TEST
• Deploy parts of build 12892 to TEST by previewing it first

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From guardian/actions-riff-raff.