Logstash maintain order of updates

I have a logstash jdbc pipeline that syncs data from postgres to elastic search. If I set the number of logstash workers to say 16. Does the pipeline still use only 1 thread. If it does use more than 1 thread then does logstash maintain the order of updates.
Like I want the update no.1 to always be updated in elasitcsearch before update no.2

If you want the order of events preserved then you have to set pipeline.workers to 1 and also (for now) disable java_execution.

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