# Warning message
**URL:** https://discuss.elastic.co/t/warning-message/123646
**Category:** Logstash
**Created:** [March 12, 2018, 9:33pm UTC](https://discuss.elastic.co/t/warning-message/123646 "2018-03-12T21:33:56Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@wakame](https://discuss.elastic.co/u/wakame)
#### Post date: [March 12, 2018, 9:33pm UTC](https://discuss.elastic.co/t/warning-message/123646/1 "2018-03-12T21:33:57Z")
I am getting the following message when trying to send data to ES.
`[2018-03-12T21:32:21,710][WARN][logstash.outputs.elasticsearch] Could not index event to Elasticsearch......"error"=>{"type"=>"mapper_parsing_exception", "reason"=>"Field name [NAME.ID] cannot contain '.'"}}}`
How can I fix this issue?
ES 2.4.1 (not 4.4.0)
LS 5.6.8
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [March 12, 2018, 9:44pm UTC](https://discuss.elastic.co/t/warning-message/123646/2 "2018-03-12T21:44:30Z")
ES 4.4 doesn't support dots in field names. Perhaps the de\_dot Logstash filter can help, or maybe upgrading to ES 5 or later is an option.
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### Author:  [@wakame](https://discuss.elastic.co/u/wakame)
#### Post date: [March 14, 2018, 2:21pm UTC](https://discuss.elastic.co/t/warning-message/123646/3 "2018-03-14T14:21:35Z")
thanks for the info, looks like I have to upgrade ES to a later version.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 11, 2018, 2:21pm UTC](https://discuss.elastic.co/t/warning-message/123646/4 "2018-04-11T14:21:36Z")
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