# Difference between index\_prefixes mapping parameter & Edge N-Gram tokenizer?

**URL:** https://discuss.elastic.co/t/difference-between-index-prefixes-mapping-parameter-edge-n-gram-tokenizer/198561
**Category:** Elasticsearch
**Created:** [September 8, 2019, 2:17pm UTC](https://discuss.elastic.co/t/difference-between-index-prefixes-mapping-parameter-edge-n-gram-tokenizer/198561 "2019-09-08T14:17:44Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![siffash](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/siffash/32/53786_2.png) [@siffash](https://discuss.elastic.co/u/siffash)
#### Post date: [September 8, 2019, 2:17pm UTC](https://discuss.elastic.co/t/difference-between-index-prefixes-mapping-parameter-edge-n-gram-tokenizer/198561/1 "2019-09-08T14:17:45Z")

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Tried them both and I can't really see the difference between the results. Is there any difference between them at all?  
Also how can I see generated tokens for the fields that have index\_prefixes mapping parameter?

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### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 6, 2019, 2:20pm UTC](https://discuss.elastic.co/t/difference-between-index-prefixes-mapping-parameter-edge-n-gram-tokenizer/198561/2 "2019-10-06T14:20:29Z")

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