See gh-9528

Closes gh-9252

Closes gh-9609

Closes gh-9617

Closes gh-9583

This commit uses the replacement for deprecated APIs in 8.5.16 to ease
a forward compatibility with Tomcat 9

Closes gh-9611

Closes gh-9611

* pr/9585:
  Add short docs on using Google App Engine

Now that Google actually supports arbitrary docker container
execution in app engine, we can provide some more guidance
on how to use it in the "deployment" section.

Closes gh-9585

* pr/9610:
  Polish

Closes gh-9610

* pr/9608:
  Remove redundant hash code for the same field

Closes gh-9608

Fixes gh-9542

Closes gh-9589

This commit removes the only use of the `javax.annotation.Resource`
annotation from the codebase. This ensures that injection point are
only defined with Spring's annotation model.

Closes gh-9441

Closes gh-9602

See gh-9603

See gh-9603

* pr/9557:
  Polish "Add health indicator for Neo4j"
  Add health indicator for Neo4j
  Remove dead code
  Add missing whitespace in log

Closes gh-9557

See gh-9557

Closes gh-9597

* pr/9597:
  Add missing whitespace in log

Closes gh-9597