Verify Indices Mappings

[bodo-hugo-barwich]

This implements the deep comparison of the deployed mappings in the ElasticSearch cluster and the definitions in the project.

$ bin/metacpan mapping --verify              # compare deployed indices and aliases with project definitions

This will show automatic unexpected adjustments made by the ElasticSearch engine which do not correspond to the intended structure.

This feature was requested and defined at:
Fix Index Corruption
as a result of the blocking incident documented at:
MetaCPAN API - Indexing failed

It introduces some of the same functionality like:
Clear Unknown Indices
which is required to create meaningful tests.

[mickeyn]

please see comments

[bodo-hugo-barwich]

@mickeyn I critically reviewed the code and changed it where it was beneficial to maintainability or operational coherence.

[bodo-hugo-barwich]

are you still interested in this feature ?

[oalders]

@mickeyn would you be able to take another look at this?

[mickeyn]

@oalders yes

[mickeyn]

LGTM

[oalders]

Thanks @bodo-hugo-barwich and @mickeyn!