[#914] Add Ditto acknowledgement label "search-persisted".Signed-off-by: Yufei Cai <yufei.cai@bosch.io>
[#914] send search-persisted acknowledgements.Duplicate-key errors are considered successes because they mayhappen during upsert.Signed-off-by: Yufei Cai <yufei.cai@bosch.io>
[#914] document "search-persisted".Signed-off-by: Yufei Cai <yufei.cai@bosch.io>
[#914] review:* some minor simplifications* solved some deprecation warnings using deprecated Akka APIs* adjusted since version to 2.0.0* updated mutability-detector.versionSigned-off-by: Thomas Jaeckle <thomas.jaeckle@bosch.io>