[DOC] Terms query can accept encoded terms input as bitmap

[bowenlan-amzn]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.

opensearch-project/OpenSearch#14774

I will raise a PR shortly to add documentation in terms query page about its new ability to accept a bitmap value which is a encoded terms list.

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.

2.17

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.