Adjust /_cat/templates not to request all metadata #78819
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DaveCTurner
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Today `GET /_cat/templates` retrieves the whole cluster metadata from the master, which includes all sorts of unnecessary junk and consumes significant resources. This commit reimplements these endpoints using `GetIndexTemplatesAction` and `GetComposableIndexTemplateAction` which are much more efficient. The docs for this API indicate that it accepts a comma-separated list of template names/patterns of the form `GET /_cat/templates/name1,name2` but in fact today it only accepts a single name or pattern. This commit also adds support for multiple names/patterns as the docs claim. Backport of elastic#78812
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This reverts commit 59cc4ba.
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Today
GET /_cat/templatesretrieves the whole cluster metadata fromthe master, which includes all sorts of unnecessary junk and consumes
significant resources. This commit reimplements these endpoints using
GetIndexTemplatesActionandGetComposableIndexTemplateActionwhichare much more efficient.
The docs for this API indicate that it accepts a comma-separated list of
template names/patterns of the form
GET /_cat/templates/name1,name2but in fact today it only accepts a single name or pattern. This commit
also adds support for multiple names/patterns as the docs claim.
Backport of #78812