Change and release version 1.9.1.4-incubator

[sjiang99]

Thank you for submitting a contribution to marklogic-community/marklogic-nifi-incubator.

In order to streamline the review of the contribution we ask you to ensure the following steps have been taken:

For all changes:

• [ ] Is there a github ticket associated with this PR? Is it referenced in the commit message?

• [ ] Has your PR been rebased against the latest commit within the target branch (typically master)?

• [ ] Is your initial contribution a single, squashed commit?

For code changes:

• [ ] Have you ensured that the full suite of tests is executed via mvn -Pcontrib-check clean install at the root nifi folder?
• [ ] Have you written or updated unit tests to verify your changes?
• [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• [ ] If applicable, have you updated the LICENSE file, including the main LICENSE file under nifi-assembly?
• [ ] If applicable, have you updated the NOTICE file, including the main NOTICE file found under nifi-assembly?
• [ ] If adding new Properties, have you added .displayName in addition to .name (programmatic access) for each of the new properties?

For documentation related changes:

• [ ] Have you ensured that format looks appropriate for the output in which it is rendered?