Added workflow template for Semantic Search using Sparse Encoders

[saimedhi]

Description

• Onboarding a new workflow preset for Semantic Search using Sparse Encoders

• For development used "opensearch-neural-sparse-encoding-v2-distill" deployed on sagemaker endpoint.

• Query used in Search Flow is Match query overridden with neural sparse query.

• Closed previous Neural Sparse Search PR Adding Neural Sparse Search preset #687 (As stated in previous PR a bug was detected while parsing the sparse vector to perform neural sparse search. It got fixed in Adds Json Parsing to nested object during update Query step in ML Inference Request processor ml-commons#3856)

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Check List

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[saimedhi]

Will Rebase this PR. Feature branch commits merged causing commit conflicts.

[ohltyler]

Looking good! I'll do some more testing on it soon. Few very minor comments.

[ohltyler]

Tested few other use cases end-to-end additionally, looks good! I'd suggest to have open issues regarding the documentation, and have them linked as an open issue in our repo as well.

[saimedhi]

Tested few other use cases end-to-end additionally, looks good! I'd suggest to have open issues regarding the documentation, and have them linked as an open issue in our repo as well.

• [FEATURE] META ISSUE for Documentation updates #745

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/dashboards-flow-framework/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/dashboards-flow-framework/backport-2.x
# Create a new branch
git switch --create backport/backport-742-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 47e06cf0ef627fb624807a07f5f60e2906d25b71
# Push it to GitHub
git push --set-upstream origin backport/backport-742-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/dashboards-flow-framework/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-742-to-2.x.