[Backport 2.x] 588 - [FEATURE] serialize requests to JSON · opensearch-project/opensearch-java@3adbd25

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, actions/setup-java@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

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