Issue using custom webhook to write to index in OpenSearch

Hello. I am attempting to use the custom webhook feature for a channel to write an alert back to an index in OpenSearch. Below is the channel that I’ve created.

POST /_plugins/_notifications/configs/
“config_id”: “sample-id5”,
“name”: “sample-name5”,
“config”: {
“name”: “Test5”,
“description”: “This is a test”,
“config_type”: “webhook”,
“is_enabled”: true,
“webhook”: {
“url”: “https://localhost:9200/alert_post/_doc/1”,
“header_params”: {
“Authorization”: “Basic YWRtaW46YWRtaW4=”,
“Content-Type”: “application/json”
“method”: “POST”

Whenever I try to send a test message, I consistently get the error below. When I construct a curl command with the same parameters I am able to write to the index just fine.

curl -POST ‘https://localhost:9200/alert_post/_doc/1’ -H ‘Content-Type: application/json’ -H ‘Authorization: Basic YWRtaW46YWRtaW4=’

Can anyone please advise on what I am doing wrong?


[status_exception] {“event_status_list”: [{“config_id”:“sample-id5”,“config_type”:“webhook”,“config_name”:“Test5”,“email_recipient_status”:,“delivery_status”:{“status_code”:“500”,“status_text”:“Failed to send webhook message Failed: {"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"failed to parse"}],"type":"mapper_parsing_exception","reason":"failed to parse","caused_by":{"type":"not_x_content_exception","reason":"Compressor detection can only be called on some xcontent bytes or compressed xcontent bytes"}},"status":400}”}}]}