# Assigning common fields with series of process id
**URL:** https://discuss.elastic.co/t/assigning-common-fields-with-series-of-process-id/144777
**Category:** Logstash
**Created:** [August 16, 2018, 8:11pm UTC](https://discuss.elastic.co/t/assigning-common-fields-with-series-of-process-id/144777 "2018-08-16T20:11:03Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@chandra0651](https://discuss.elastic.co/u/chandra0651)
#### Post date: [August 16, 2018, 8:11pm UTC](https://discuss.elastic.co/t/assigning-common-fields-with-series-of-process-id/144777/1 "2018-08-16T20:11:03Z")
Hello i have a application where it will generate a process id for each log and one process id will be having 8 different stages of logs.But there is one specific field will be coming as part of 1st stage of log but remaining stages of log wont have that field . is there a way i can assign that specific field in stage one to all log files while ingesting as a field in logstash. The time gap between the each stage of log files is in milli seconds.
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### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [August 16, 2018, 8:17pm UTC](https://discuss.elastic.co/t/assigning-common-fields-with-series-of-process-id/144777/2 "2018-08-16T20:17:42Z")
Provided that log entries are never interleaved, and you use "--pipeline.workers 1" and do not use "--experimental-java-execution" you could do it using something similar to [this](https://discuss.elastic.co/t/logstash-data-between-start-and-end-transaction/143735/2?u=badger).
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### Author:  [@chandra0651](https://discuss.elastic.co/u/chandra0651)
#### Post date: [August 16, 2018, 8:27pm UTC](https://discuss.elastic.co/t/assigning-common-fields-with-series-of-process-id/144777/3 "2018-08-16T20:27:27Z")
Well no guaranty that logs are interleaved , no other way ☹
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 13, 2018, 8:27pm UTC](https://discuss.elastic.co/t/assigning-common-fields-with-series-of-process-id/144777/4 "2018-09-13T20:27:31Z")
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