Regarding nested json parsing at index time

[snehal]

I want to parse nested json at index time , what will be the props and trandform.I want separate all messages fields in seperate line

{ [-]
   id: 3614979212324797096956714454
   message: {"@t":"2021-05-14T17:19:02.0149138Z","@m":"Upload metrics: \"{ duration = 81.9555, productCode = ct, tenantCode = , validBundle = True, validProductCode = True, validTenantCode = , bundleSize = 9670, successful = True }\"","@i":"0b918ffa","@l":"Information","@lt":"dev","metrics":"{ duration = 81.9555, productCode = ct, tenantCode = , validBundle = True, validProductCode = True, validTenantCode = , bundleSize = 9670, successful = True }","SourceContext":"Atlas.FhirStore.Api.Services.MetricsFhirResourceService","ActionId":"43adca80-545-4b1f-b9dd-d4008f3594b3","ActionName":"Atlas.FhirStore.Api.Controllers.FhirResourceController.UploadBundle (Atlas.FhirStore.Api)","RequestId":"0HM8MV64LIURF","RequestPath":"/api/v1/CT/bundle","SpanId":"|eb806e4b-47275043ec09ec97.2.a9d44dc9_","TraceId":"eb806e4b-47275043ec09ec97","ParentId":"|eb806e4b-47275043ec09ec97.2.","ThreadId":14,"X-Correlation-Id":"0HM8K136VRBAK:00000156","X-Correlation-Name":"IntegrationHubService"}
   timestamp: 1621012742015
}

[kamlesh_vaghela]

@snehal 

Can you please share your _raw which has multiple messages value in code format? 

Screenshot 2021-05-15 at 9.32.53 AM.png