[BUG] PUT _plugins/_transform/<transform_id> hangs indefinitely

[Pablosko98]

Describe the bug

PUT _plugins/_transform/<transform_id> call with correct body hangs indefinitely after pulling OpenSearch 2.12 Exact same request works fine in 2.11

Related component

Plugins

To Reproduce

1. Hit /_plugins/_transform/test with the following body:

   {        
   "transform": {
       "enabled": true,
       "continuous": true,
       "description": "",
       "groups": [
           {
               "date_histogram": {
                   "calendar_interval": "1h",
                   "source_field": "datetime",
                   "target_field": "datetime",
                   "timezone": "UTC"
               }
           }
       ],
       "page_size": 1,
       "roles": [],
       "schedule": {
           "interval": {
               "unit": "Hours",
               "period": "1"
           }
       },
       "source_index": "test-source",
       "target_index": "test-target"
   }
   }

2. Observe the operation hanging indefinitely

Expected behavior

Operation should return a 201 Created response.

Additional Details

Validation seems to work. For example:

• {"transform": {"enabled": trueeeeeee}} correctly returns a 400 with json_parse_exception
• Nonexistent source_index correctly returns a 404 with "No specified source index exist in the cluster"

[msfroh]

@opensearch-project/admin -- can we please move this to the https://github.com/opensearch-project/index-management repo?

[enieto-vex]

Same happens to me, I cant create transforms with the Transform API after upgrade to OpenSearch 2.12

[amaciejk]

this appears to have the same root cause as: https://github.com/opensearch-project/index-management/issues/1161 but for transforms you unfortunately don't get the nice error msg explaining that the start_time field is missing.

[dblock]

Does anyone want to PR a fix?

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