[x] Implemented tests for combination with other commands
[x] New added source code should include a copyright header
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Description
Support parsing lambda function. The lambda function will be used as an argument for some functions to be added this PR: https://github.com/opensearch-project/opensearch-spark/pull/864. This PR is separated from that one.
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--signoffBy submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.