Prior to this commit, Spring Boot would only auto-configure the
`RestHighLevelClient` and `RestClientBuilder` if the
`RestHighLevelClient` was present. This was done in 1d73d4ed.
This commit brings back the exposing of the `RestClient` bean in when
exposing the `RestHighLevelClient` or when the `RestHighLevelClient`
is not present. It allows for using the auto-configuration and its
customizers of the `RestClientBuilder` in a similar way as it is done
for the `RestTemplateBuilder` and the `WebClient.Builder`.
The presence of the `elasticsearch-rest-high-level-client` module is
now optional. This opens the door for potentially adding support for
the new Elasticsearch Java Client[1] that is based on the same
`RestClient`.
The health contributor and its configuration has also been updated to
only depend on the low-level RestClient.
See gh-28496
[1] https://github.com/elastic/elasticsearch-java
This commit replaces "you're" with some other structure, often
simplifying the sentence in the process.
Also checked for words that end with "'ll" and "n't" but did not find
any.
See gh-28710
Previously, a number of Elasticsearch properties were duplicated
across the spring.elasticsearch.rest and
spring.data.elasticsearch.client.reactive prefixes for configuring
the blocking REST client provided by Elasticsearch and the reactive
client provided by Spring Data respectively. This could cause
problems when using the Elasticsearch REST client configured with
a custom spring.elasticsearch.rest.uris. If Spring WebFlux (to make
use of WebClient) and Spring Data Elasticsearch were on the classpath,
the reactive Elasticsearch Client would be autoconfigured but it
would use the default value of its analogous
spring.data.elasticsearch.client.reactive.endpoints property. It
would be unable to connect, causing a startup failure.
This commit consoliates the configuration properties where possible.
Each setting that is common across the two clients is now configured
using a single, shared spring.elasticsearch property. Each setting
that is specific to the blocked REST client or the WebClient-based
reactive client now have prefixes of spring.elasticsearch.restclient
and spring.elasticsearch.webclient respectively.
The old properties beneath spring.elasticsearch.rest and
spring.data.elasticsearch.client.reactive have been deprecated. If a
any deprecated property is set, all of the new properties are
ignored. In other words, to migrate to the new properties, each usage
of a now-deprecated property must be updated to use its new
replacement instead.
Closes gh-23106
