See gh-16682

Fix formatting issues, primarily around header comments.

Closes gh-17080

Closes gh-17084

Closes gh-17083

Closes gh-17082

Closes gh-17077

Closes gh-17079

Closes gh-17078

This commit configures a `PathPatternRouteMatcher` in the RSocket
support if spring-web is on the classpath. This `RouteMatcher`
implementation is more efficient than the `SimpleRouteMatcher`, which is
based on the `AntPathMatcher`.

Closes gh-16865

See gh-17075

As of Spring Data Moore, a new reactive template and the
corresponding repositories support have been added.

This commit auto-configures a `ReactiveElasticsearchTemplate`
with the configuration properties under the
`spring.data.elasticsearch.client.reactive` namespace.
To enable this feature, applications require both Spring Data
Elasticsearch dependencies (typically
`spring-boot-starter-data-elasticsearch`) and dependencies
for a `WebClient` (often `spring-boot-starter-webflux`).

The support for the reactive Elasticsearch repositories is
also provided.

Closes gh-16214

* pr/16717:
  Polish "Optimize CacheKey handling for immutable sources"
  Optimize CacheKey handling for immutable sources

Closes gh-16717

Make immutable properties more explicit and trust that they
truly won't change.

See gh-16717

Update `SpringIterableConfigurationPropertySource` so that cache keys
do not need to be checked if property sources are immutable.

See gh-16717

Closes gh-16682