[Enhancement] Adds method_parameters in neural search query to support ef_search

[shatejas]

Description

Enables efsearch and nprobes for neural search

merging from feature branch Original approved PR: https://github.com/opensearch-project/neural-search/pull/787

Check List

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

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[vibrantvarun]

There is some issue in bwc I ran it locally and the same error which are coming on CI are also coming on local.

[navneet1v]

Merging this Pr as without this PR is causing other main branch code is breaking