# Elapsed\_expired\_error event is not generated for same repeated logs
**URL:** https://discuss.elastic.co/t/elapsed-expired-error-event-is-not-generated-for-same-repeated-logs/160316
**Category:** Logstash
**Created:** [December 11, 2018, 8:00am UTC](https://discuss.elastic.co/t/elapsed-expired-error-event-is-not-generated-for-same-repeated-logs/160316 "2018-12-11T08:00:27Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@shwesinhan](https://discuss.elastic.co/u/shwesinhan)
#### Post date: [December 11, 2018, 8:00am UTC](https://discuss.elastic.co/t/elapsed-expired-error-event-is-not-generated-for-same-repeated-logs/160316/1 "2018-12-11T08:00:28Z")
hi there
i use logstash elapsed filter to get latency between req and resp logs
logstash elapsed help me a lot. but for repeated req (same unique\_id\_field) logs it doesn't show correct count.
here i test elapsed config
> elapsed {
> start\_tag =\> "app1\_req"
> end\_tag =\> "app1\_res"
> unique\_id\_field =\> "app\_id"
> periodic\_flush =\> true
> timeout =\> 60
> add\_tag =\> ["app1"]
> new\_event\_on\_match =\> true
> }
i send app1\_req `8 times` with `same app_id` within 5 mins and i don't send app1\_res.
because i want to know how may elapsed\_expired\_error events i get.
and i only ` got 3` elapsed\_expired\_error events. why?
it supposes to be ` 8` right?
because of overwirte before periodic\_flush do?
does anybody plz explain to me?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 8, 2019, 8:00am UTC](https://discuss.elastic.co/t/elapsed-expired-error-event-is-not-generated-for-same-repeated-logs/160316/2 "2019-01-08T08:00:28Z")
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