# Replace old documents
**URL:** https://discuss.elastic.co/t/replace-old-documents/207126
**Category:** Logstash
**Created:** [November 8, 2019, 2:10pm UTC](https://discuss.elastic.co/t/replace-old-documents/207126 "2019-11-08T14:10:59Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@shankaran](https://discuss.elastic.co/u/shankaran)
#### Post date: [November 8, 2019, 2:10pm UTC](https://discuss.elastic.co/t/replace-old-documents/207126/1 "2019-11-08T14:10:59Z")
in My application Every day 6 times (4hrs per run) index will be updated by latest exchange rates documents.
Any one could guide me on best approach how to delete my old documents (having SourceCurrency=USD) from logstash and insert new documents to elasticsearch (for SourceCurrency=USD)?
1. I have multiple documents for same SourceCurrency=USD.
1. I dont want to update price document. I have to delete all old price documents having (SourceCurrency=USD) and then new document should be inserted ( since every run number of documents will vary for same SourceCurrency=USD)
2. there is no document\_id i havent defined. i cant create document id with combination of SourceCurrency+DestinationCurrency since i may not sure will get same number of destination currency all time. i dont want to retain the destination currency which is not received in latest run.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 6, 2019, 2:11pm UTC](https://discuss.elastic.co/t/replace-old-documents/207126/2 "2019-12-06T14:11:12Z")
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