logging - Parse logs with opentelemetry collector - Stack Overflow

Im trying parse logs received in my opentelemetry collector from one application in spring boot using logback by grpc with otlp protoco and finally send to elasticsearch by collector opentelemetry-collector-contrib:0.117.0

My intention is from this example log:

2025-02-26T09:00:13.611503606+01:00 DEBUG [2025-02-26 09:00:13,610] [.springframework.kafka.KafkaListenerEndpointContainer#15-0-C-1] [] [UpdateSettingsListener] Handling command UpdateSettingsMessage[**context=SAAI-egypt**, additional={interval_canceled=20, booking_status=[1, 3], api_keys=[api-key], last_fetch_date=2025-02-26T08:00:03.985Z, date_filter_mode=3, interval_active=10}], received at 1740556813610

I've tried all types of processors: transform, text, etc but nothing works...

Extract a new field "context" with dynamic value in every log for output in elasticsearch:

Desired result:

{
  "_index": ".ds-dvlp-op-ci-bin-log-2025.02.25-000062",
  "_id": "0nfqQZUBuQEk-wxXPD8h",
  "_version": 1,
  "_score": 0,
  "_source": {
    "@timestamp": "2025-02-26T11:00:08.839000000Z",
    "Body": "Command: UpdateAdditionalSettings[lastFetchDate=2025-02-26T11:00:01.973Z, context=SAAI-egypt] executed at 1740567608839",
  "context": SAAI-egypt
}