Watcher updates_documents is not working after v7.3

Hi,

I am keep getting the below error that failed to execute the update documents in Watcher after we upgraded to Kibana v7.3. , we have valid certificate but Kibana does not seem to agree, how can I check and any advice that might resolve the problem? Thank you!

    "id": "update_documents",
    "type": "webhook",
    "status": "failure",
    "error": {
      "root_cause": [
        {
          "type": "s_s_l_handshake_exception",
          "reason": "PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"
        }
      ],
      "type": "s_s_l_handshake_exception",
      "reason": "PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target",
      "caused_by": {
        "type": "validator_exception",
        "reason": "PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target",
        "caused_by": {
          "type": "sun_cert_path_builder_exception",
          "reason": "unable to find valid certification path to requested target"
        }

verify permissions on your certif path and certif itself