QueryByExampleExecutor.find one should return Optional<S>. [DATACMNS-1058]

[spring-projects-issues]

Christoph Strobl opened DATACMNS-1058 and commented

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Issue Links:

• DATAJPA-1110 Adapt QueryByExampleExecutor API changes
  ("is depended on by")
• DATAMONGO-1685 Adapt QueryByExampleExecutor API changes
  ("is depended on by")

Referenced from: pull request #214