* pr/9544:
  Polish "Use getUsableSpace() in DiskSpaceHealthIndicator"
  Use getUsableSpace() in DiskSpaceHealthIndicator

Closes gh-9544

See gh-9544

Closes gh-9547

This commit makes sure that if the `register-mbeans` property of the
Hikary datasource config is set, Spring Boot doesn't attempt to expose
the mbean again.

Closes gh-5114

Closes gh-9550

* pr/8534:
  Polish
  Polish "Add support for CustomConversions with Cassandra"
  Add support for CustomConversions with Cassandra

Closes gh-8534

This commit add the support for CustomConversions in
spring-data-cassandra. To customize, bean just need to be declared and
it will be auto-configured.

See gh-8534

* pr/9539:
  Upgrade to Spring Retry 1.2.1

Closes gh-9539

Fixes gh-9435

See gh-9538

Closes gh-9537

See gh-9374

Closes gh-9287

Closes gh-9288

Closes gh-9505

Closes gh-8680

Elastic have announced [1] that embedded Elasticsearch is no longer
supported. This commit brings us into line with that announcement by
removing the auto-configuration that would create an Elasticsearch
Node and NodeClient.

To use the Elasticsearch auto-configuration, a user must now provide
the address of one or more cluster nodes
(via the spring.elastisearch.cluster-nodes property) which will then
be used to create a TransportClient.

See gh-9374

[1] https://www.elastic.co/blog/elasticsearch-the-server

Previously, RedisTestServer only supported Jedis and would blow up if
only Lettuce was on the classpath. This commit defensively checks which
driver is available and chose the appropriate one, defaulting to Jedis.

Closes gh-9524

* pr/9526:
  Polish "Set Lettuce shutdown timeout properly"
  Reduce Lettuce shutdown timeout to 100ms
  Set Lettuce shutdown timeout properly

Closes gh-9526

Reducing the default to 100ms is a good compromise to retain a quiet time
in for parallel execution and optimize for default, single-threaded
execution (such as test execution or regular application shutdown). The
shutdown timeout can be adjusted to fit specific application needs.

See gh-9526

We now properly set the Lettuce client shutdown for unpooled and pooled
configuration.

See gh-9526

Closes gh-9521

* pr/9443:
  Polish
  Polish "Allow abstract serializers/deserializer in @JsonComponent"
  Allow abstract serializers/deserializer in @JsonComponent