Add support for knn to have qualifiers

[peterzhuamazon]

Signed-off-by: Peter Zhu [email protected]

Description

Add support for knn to have qualifiers

Issues Resolved

Part of opensearch-project/opensearch-build#1624, opensearch-project/opensearch-build#1632
#315

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed as per the DCO using --signoff

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[martin-gaievski]

@dblock @peterzhuamazon We have done another part of this change in a different PR - #324 assuming following - qualifier for plugin applies to both plugin and the base open-search versions as the same time (if I set qualifier to "alpha1" it will pull opensearch of version "alpha1" and build the plugin artifacts of "alpha1"). Is this correct understanding?

[peterzhuamazon]

@dblock @peterzhuamazon We have done another part of this change in a different PR - #324 assuming following - qualifier for plugin applies to both plugin and the base open-search versions as the same time (if I set qualifier to "alpha1" it will pull opensearch of version "alpha1" and build the plugin artifacts of "alpha1"). Is this correct understanding?

Set opensearch.version to 2.0.0-alpha1 will pull 2.0.0-alpha1 opensearch.
build qualifier is to set your plugin to have alpha1 in knn build.