NIFI-6647 - Upgrading Apache Ignite version to 2.8.0

[matthew-formosa-gig]

Description of PR

The version of Apache Ignite is currently set to 1.6.0 which is now over 3 years old. Upgrading to the latest version, that is 2.8.0.

For all changes:

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

• Does your PR title start with NIFI-XXXX where XXXX is the JIRA number you are trying to resolve? Pay particular attention to the hyphen "-" character.

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

• Is your initial contribution a single, squashed commit? Additional commits in response to PR reviewer feedback should be made on this branch and pushed to allow change tracking. Do not squash or use --force when pushing to allow for clean monitoring of changes.

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?
• Have you verified that the full build is successful on both JDK 8 and JDK 11?

[matthew-formosa-gig]

@jtstorck could you please review this by any chance? Saw you had other PRs related to Apache Ignite.

[joewitt]

@matthew-formosa-gig can you find out what is creating

Untracked files:
(use "git add ..." to include in what will be committed)
nifi-nar-bundles/nifi-ignite-bundle/nifi-ignite-processors/ignite/

It should create directories under target so it is cleanly handled during the build process and properly ignored in terms of source/etc..

otherwise this looks ready to roll. I could build fine on java8 and java 11 and the travis issues weren't related to this PR so otherwise it is ready

[joewitt]

@matthew-formosa-gig the ignite folks leave a quite nice readme in there

This is Apache Ignite working directory that contains information that
Ignite nodes need in order to function normally.
Don't delete it unless you're sure you know what you're doing.

You can change the location of working directory with
igniteConfiguration.setWorkingDirectory(location) or
in IgniteConfiguration .
README.txt (END)

[matthew-formosa-gig]

Thanks for your feedback. Successfully redirected work directory to target folder.

[matthew-formosa-gig]

@joewitt Kind reminder with regards to this PR.

[matthew-formosa-gig]

@joewitt It's been a while :) Upgraded to Apache Ignite 2.8.0. Tests are successful locally, not sure why some seem to be failing on ci-workflow.

[matthew-formosa-gig]

#4278 includes this change.