Closes gh-16682

Closes gh-16682

Closes gh-16682

* pr/16972:
  Polish "Make it easier to set bufferRequestBody"
  Make it easier to set bufferRequestBody

Closes gh-16972

See gh-16972

Update `RestTemplateBuilder` to make it easier to set
the `bufferRequestBody` value on a underlying `ClientHttpRequestFactory`

See gh-16972

See gh-16544

This commit auto-configures the Elasticsearch REST client support
as a template for Spring Data Elasticsearch. As of this commit,
using the transport client is still possible but developers
should migrate.

This commit also removes the deprecated annotation on the
Elasticsearch auto-configuration for the transport client, since
this deprecation notice is already present on the configuration
property.

Closes gh-17024
Closes gh-16542

Closes gh-16537

Closes gh-16107

Closes gh-10926

* pr/17034:
  KafkaAutoConfigurationIntegrationTests to JUnit5

Closes gh-17034

See gh-17034

* pr/16544:
  Polish "Support JsonComponent key serializers/deserialzers"
  Support JsonComponent key serializers/deserialzers

Closes gh-16544

See gh-16544

Update `@JsonComponent` so that it can also be used to register key
serializers and deserializers.

See gh-16544

* pr/16987:
  Polish "Avoid using deprecated NCSARequestLog"
  Avoid using deprecated NCSARequestLog

Closes gh-16987

See gh-16987

See gh-16987

* pr/17044:
  Polish "Fix typo in javadoc"
  Fix typo in javadoc

Closes gh-17044

See gh-17044

See gh-17044