Previously the MongoDB health indicates used Spring Data's templates
(imperative and reactive) to access MongoDB. This prevented health
information from being available in apps using Mongo's Java Driver
directly.
This commit updates the health indicates so that they no longer
depend upon Spring Data MongoDB and instead using MongoDB's Java
Driver directly. As they no longer depend on Spring Data MongoDB,
the indicators have also moved from spring-boot-data-mongodb to
spring-boot-mongodb.
Closes gh-47051
Andy Wilkinson
Stéphane Nicoll
Moritz Halbritter
Phillip Webb