# How to avoid duplicate fields copied during bulk indexing?

**URL:** <https://discuss.elastic.co/t/how-to-avoid-duplicate-fields-copied-during-bulk-indexing/219528>\
**Category:** Elasticsearch\
**Created:** [February 16, 2020, 4:55pm UTC](https://discuss.elastic.co/t/how-to-avoid-duplicate-fields-copied-during-bulk-indexing/219528 "2020-02-16T16:55:40Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [February 16, 2020, 5:46pm UTC](https://discuss.elastic.co/t/how-to-avoid-duplicate-fields-copied-during-bulk-indexing/219528/2 "2020-02-16T17:46:59Z")

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Let's keep the discussion only in [How to use custom field type in mappings to achieve multiple type mappings within an index?](https://discuss.elastic.co/t/how-to-use-custom-field-type-in-mappings-to-achieve-multiple-type-mappings-within-an-index/219530) as this is basically the same topic.

I'm closing this thread.

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_[View the full topic](https://discuss.elastic.co/t/how-to-avoid-duplicate-fields-copied-during-bulk-indexing/219528)._