# How to use custom field type in mappings to achieve multiple type mappings within an index? **URL:** \ **Category:** Elasticsearch\ **Created:** [February 16, 2020, 5:02pm UTC](https://discuss.elastic.co/t/how-to-use-custom-field-type-in-mappings-to-achieve-multiple-type-mappings-within-an-index/219530 "2020-02-16T17:02:42Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![prasad98](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/prasad98/32/64837_2.png) [@prasad98](https://discuss.elastic.co/u/prasad98)\ **Post date:** [February 16, 2020, 5:02pm UTC](https://discuss.elastic.co/t/how-to-use-custom-field-type-in-mappings-to-achieve-multiple-type-mappings-within-an-index/219530/1 "2020-02-16T17:02:42Z")
Hi, I'm trying to migrate my elasticsearch from 2.4 to 7.5 I was working on fixing breaking changes in the mappings. This example here (for custom field type): [https://www.elastic.co/guide/en/elasticsearch/reference/current/removal-of-types.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/removal-of-types.html) seems to be not working as it gives error for the `doc` field. Here they ES blog has mentioned best use of custom type field: [https://www.elastic.co/blog/kibana-6-removal-of-mapping-types](https://www.elastic.co/blog/kibana-6-removal-of-mapping-types) But I'm not able to figure it out, how should I create it ? Based on this question - consider there are two types of mapping like `product` and `category`. I want them within 1 index only. How should I create it ? Reference doubt on discussion forum: [How to avoid duplicate fields copied during bulk indexing?](https://discuss.elastic.co/t/how-to-avoid-duplicate-fields-copied-during-bulk-indexing/219528) ---
**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, 5:47pm UTC](https://discuss.elastic.co/t/how-to-use-custom-field-type-in-mappings-to-achieve-multiple-type-mappings-within-an-index/219530/2 "2020-02-16T17:47:42Z")
Could you provide a full recreation script as described in [About the Elasticsearch category](https://discuss.elastic.co/t/about-the-elasticsearch-category/21). It will help to better understand what you are doing. Please, try to keep the example as simple as possible. A full reproduction script will help readers to understand, reproduce and if needed fix your problem. It will also most likely help to get a faster answer. So provide a typical example of your 2 types. ---
**Author:** ![prasad98](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/prasad98/32/64837_2.png) [@prasad98](https://discuss.elastic.co/u/prasad98)\ **Post date:** [February 16, 2020, 6:39pm UTC](https://discuss.elastic.co/t/how-to-use-custom-field-type-in-mappings-to-achieve-multiple-type-mappings-within-an-index/219530/3 "2020-02-16T18:39:47Z")
> [@prasad98](#): > > Based on this question - consider there are two types of mapping like `product` and `category` . I want them within 1 index only. How should I create it ? @dadoonet I'm using GoLang client API. This one- [GitHub - olivere/elastic: Deprecated: Use the official Elasticsearch client for Go at https://github.com/elastic/go-elasticsearch](https://github.com/olivere/elastic/tree/release-branch.v7) My mapping for single index including multiple types: `product` and `category`. ```auto mappings := map[string]interface{}{ "properties": map[string]interface{}{ "category": map[string]interface{}{ "properties": map[string]interface{}{ "id": map[string]interface{}{"type": "long"}, "name": map[string]interface{}{"type": "text"}, "type": map[string]interface{}{"type": "text"}, "image_version": map[string]interface{}{ "type": "nested", "properties": map[string]interface{}{ "image_height": map[string]interface{}{"type": "float"}, "image_width": map[string]interface{}{"type": "float"}, }, }, }, }, "product": map[string]interface{}{ "properties": map[string]interface{}{ "activity_name": map[string]interface{}{"type": "text"}, "app_type": map[string]interface{}{"type": "text"}, }, }, }, } ``` When I try to bulk index the data, it creates a single index with mappings like this: ```auto { "mappings": { "properties": { "category": { "properties": { "id": { "type": "integer" }, "name": { "type": "keyword" }, "type": { "type": "text" }, "image_version": { "type": "nested", "properties": { "image_height": { "type": "float" }, "image_width": { "type": "float" } } } } }, "id": { "type": "integer" }, "name": { "type": "keyword" }, "type": { "type": "text" }, "image_version": { "type": "nested", "properties": { "image_height": { "type": "float" }, "image_width": { "type": "float" } } }, "product": { "properties": { "activity_name": { "type": "text" }, "app_type": { "type": "text" } } } } } } ``` As you can notice it is copying `category` fields data outside `category` root field too. Why the fields inside `properties` are being copied outside `category` ? How should I avoid it? How should I define custom types? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 15, 2020, 6:39pm UTC](https://discuss.elastic.co/t/how-to-use-custom-field-type-in-mappings-to-achieve-multiple-type-mappings-within-an-index/219530/4 "2020-03-15T18:39:50Z")
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