[BUG] Report definition - unable to create scheduled cron job with EST timezones

[MonishaSukumar]

User is trying to create a scheduled cron job with the EST timezone. But report definition creation fails with an internal server error.

API -

POST - /api/reporting/reportDefinition

Payload -

{"report_params":{"report_name":"report-est","report_source":"Dashboard","description":"","core_params":{"base_url":"/app/dashboards#/view/51d08090-07a2-11ef-90f6-3b851ae6e26c","report_format":"pdf","time_duration":"PT30M"}},"delivery":{"configIds":[],"title":"","textDescription":"","htmlDescription":""},"trigger":{"trigger_type":"Schedule","trigger_params":{"enabled_time":1720528976669,"schedule":{"cron":{"expression":"0 12 * * *","timezone":"EST"}},"schedule_type":"Cron based","enabled":true}}}

Response -
{
"statusCode": 500,
"error": "Internal Server Error",
"message": "Unknown time-zone ID: EST"
}

Opensearch Dashboards version - 1.2.0, issue still persist in 2.12 version too.

[dblock]

[Catch All Triage - 1, 2, 3, 4]