Merge pull request #433 from splunk/release-2.2.2

chore: bump version

chore: bump version

Merge pull request #418 from splunk/prep-2.2.0

release: Prepare for 2.2.0

Merge pull request #409 from splunk/prep-2.1.2

chore: prep 2.1.2, update docs

Prepare for 2.1.1

Upgrade the release version

Merge pull request #342 from splunk/release/2.0.9

Upgrade release version to 2.0.9

Upgrade release version

Update log4j version to 2.17.1

add release to pom