# Lab contain Missing field

**URL:** <https://discuss.elastic.co/t/lab-contain-missing-field/299127>\
**Category:** Elastic Observability\
**Created:** [March 8, 2022, 5:58pm UTC](https://discuss.elastic.co/t/lab-contain-missing-field/299127 "2022-03-08T17:58:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![LuciusLin](https://avatars.discourse-cdn.com/v4/letter/l/91b2a8/32.png) [@LuciusLin](https://discuss.elastic.co/u/LuciusLin)\
**Post date:** [March 8, 2022, 5:58pm UTC](https://discuss.elastic.co/t/lab-contain-missing-field/299127/1 "2022-03-08T17:58:36Z")

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Hi  
Hope any one can help to resolve an issue I have encountered. I am attempting the first Lab for Observability where I need to start my heartbeat.yml. Anyone can advise on the error message below?

INFO instance/beat.go:299 Setup Beat: heartbeat; Version: 7.9.1

INFO [index-management] idxmgmt/std.go:184 Set output.Elasticsearch.index to 'heartbeat-7.9.1' as ILM is enabled.

ERROR instance/beat.go:951 Exiting: error initializing publisher: missing required field accessing 'output.Elasticsearch.hosts'

Exiting: error initializing publisher: missing required field accessing 'output.Elasticsearch.hosts'

Regards  
Lin

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 4, 2022, 8:34am UTC](https://discuss.elastic.co/t/lab-contain-missing-field/299127/2 "2022-11-04T08:34:32Z")

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