Fix bedrock embedding generation issue

[zane-neo]

Description

Fix bedrock embedding generation issue

Issues Resolved

#2490

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

By 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.

[zane-neo]

The failure checks are caused by circuit breaker, seems github resources are not enough to run some ITs, e.g.:

REPRODUCE WITH: gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.rest.RestMLFlowAgentIT.testAgentSearchIndexTool" -Dtests.seed=C9BBBF8374D42354 -Dtests.security.manager=false -Dtests.locale=lv-LV -Dtests.timezone=America/Argentina/Rio_Gallegos -Druntime.java=21

org.opensearch.ml.rest.RestMLFlowAgentIT > testAgentSearchIndexTool FAILED
    org.opensearch.client.ResponseException: method [POST], host [http://127.0.0.1:64840/], URI [/_plugins/_ml/agents/rvA9BZABoBZUGpIM8j1j/_execute], status line [HTTP/1.1 429 Too Many Requests]
    {"error":{"reason":"System Error","details":"Memory Circuit Breaker is open, please check your resources!","type":"CircuitBreakingException"},"status":429}
        at __randomizedtesting.SeedInfo.seed([C9BBBF8374D42354:742BA860D5C91457]:0)
        at app//org.opensearch.client.RestClient.convertResponse(RestClient.java:385)
        at app//org.opensearch.client.RestClient.performRequest(RestClient.java:355)
        at app//org.opensearch.client.RestClient.performRequest(RestClient.java:330)
        at app//org.opensearch.ml.utils.TestHelper.makeRequest(TestHelper.java:179)
        at app//org.opensearch.ml.utils.TestHelper.makeRequest(TestHelper.java:152)
        at app//org.opensearch.ml.rest.RestMLFlowAgentIT.executeAgent(RestMLFlowAgentIT.java:131)
        at app//org.opensearch.ml.rest.RestMLFlowAgentIT.executeAgentSearchIndexTool(RestMLFlowAgentIT.java:115)
        at app//org.opensearch.ml.rest.RestMLFlowAgentIT.testAgentSearchIndexTool(RestMLFlowAgentIT.java:62)

Have created this issue to track this: #2528.