[BWC] No Indexing and Search BWC tests added for Lucene Engine

[navneet1v]

Description

Currently in k-NN plugin there are BWC tests added for different engine and algorithms to ensure that we are able to catch any BWC issues with the new changes that happening in k-NN plugin. But for Lucene engine no BWC tests have been found.
Ref1: https://github.com/opensearch-project/k-NN/blob/main/qa/restart-upgrade/src/test/java/org/opensearch/knn/bwc/IndexingIT.java

Ref2: https://github.com/opensearch-project/k-NN/blob/main/qa/rolling-upgrade/src/test/java/org/opensearch/knn/bwc/IndexingIT.java

The aim of this issue is to add the BWC tests for Lucene Engine.

[buddharajusahil]

Hi Navneet, I would like to be assigned this issue!