# Parse 2 times csv files

**URL:** <https://discuss.elastic.co/t/parse-2-times-csv-files/86804>\
**Category:** Elasticsearch\
**Created:** [May 23, 2017, 12:21pm UTC](https://discuss.elastic.co/t/parse-2-times-csv-files/86804 "2017-05-23T12:21:28Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Mouad\_Mimouni](https://avatars.discourse-cdn.com/v4/letter/m/aeb1de/32.png) [@Mouad\_Mimouni](https://discuss.elastic.co/u/Mouad_Mimouni)\
**Post date:** [May 23, 2017, 12:21pm UTC](https://discuss.elastic.co/t/parse-2-times-csv-files/86804/1 "2017-05-23T12:21:28Z")

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Hello,  
I want to know how elasticsearch works when i parse 2 times the same csv file with the same data  
Thank you

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [May 23, 2017, 1:09pm UTC](https://discuss.elastic.co/t/parse-2-times-csv-files/86804/2 "2017-05-23T13:09:55Z")

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If you are using the same id for docs then it will reindex old data.  
If you are using different ids or no id at all then new content will be added

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<div class="post-metadata">

**Author:** ![Mouad\_Mimouni](https://avatars.discourse-cdn.com/v4/letter/m/aeb1de/32.png) [@Mouad\_Mimouni](https://discuss.elastic.co/u/Mouad_Mimouni)\
**Post date:** [May 23, 2017, 1:33pm UTC](https://discuss.elastic.co/t/parse-2-times-csv-files/86804/3 "2017-05-23T13:33:36Z")

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How can i declare the id? Is this in the configuration file of logstash?

Thank you for your answer

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<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [May 23, 2017, 2:46pm UTC](https://discuss.elastic.co/t/parse-2-times-csv-files/86804/4 "2017-05-23T14:46:57Z")

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Yes. See [https://www.elastic.co/guide/en/logstash/current/plugins-outputs-elasticsearch.html#plugins-outputs-elasticsearch-document\_id](https://www.elastic.co/guide/en/logstash/current/plugins-outputs-elasticsearch.html#plugins-outputs-elasticsearch-document_id)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 20, 2017, 2:47pm UTC](https://discuss.elastic.co/t/parse-2-times-csv-files/86804/5 "2017-06-20T14:47:33Z")

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