fix multiple docs support

[ylwu-amzn]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

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

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[ylwu-amzn]

Integ failed because the cohere quota exceeds for the test account

REPRODUCE WITH: ./gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.rest.RestMLRemoteInferenceIT.testCohereGenerateTextModel" -Dtests.seed=54555B65197ED56E -Dtests.security.manager=false -Dtests.locale=hr-HR -Dtests.timezone=Etc/GMT+11 -Druntime.java=11
org.opensearch.ml.rest.RestMLRemoteInferenceIT > testCohereClassifyModel FAILED
    org.opensearch.client.ResponseException: method [POST], host [http://127.0.0.1:33653/], URI [/_plugins/_ml/models/e_hWJosBIW8S_7IqL-QK/_predict], status line [HTTP/1.1 429 Too Many Requests]
    {"error":{"root_cause":[{"type":"status_exception","reason":"Error from remote service: {\"message\":\"You are using a Trial key, which is limited to 1000 API calls / month. You can continue to use the Trial key for free or upgrade to a Production key with higher rate limits at 'https://dashboard.cohere.ai/api-keys'. Contact us on 'https://discord.gg/XW44jPfYJu' or email us at [email protected] with any questions\"}"}],"type":"status_exception","reason":"Error from remote service: {\"message\":\"You are using a Trial key, which is limited to 1000 API calls / month. You can continue to use the Trial key for free or upgrade to a Production key with higher rate limits at 'https://dashboard.cohere.ai/api-keys'. Contact us on 'https://discord.gg/XW44jPfYJu' or email us at [email protected] with any questions\"}"},"status":429}
        at __randomizedtesting.SeedInfo.seed([54555B65197ED56E:7257DBEB16974E68]:0)