# Combining many field as JSON and made it into a single field - PerformanceCombining many field as JSON and made it into a single field - Performance

**URL:** <https://discuss.elastic.co/t/combining-many-field-as-json-and-made-it-into-a-single-field-performancecombining-many-field-as-json-and-made-it-into-a-single-field-performance/47577>\
**Category:** Elasticsearch\
**Created:** [April 17, 2016, 8:31am UTC](https://discuss.elastic.co/t/combining-many-field-as-json-and-made-it-into-a-single-field-performancecombining-many-field-as-json-and-made-it-into-a-single-field-performance/47577 "2016-04-17T08:31:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![imaravin](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/imaravin/32/9213_2.png) [@imaravin](https://discuss.elastic.co/u/imaravin)\
**Post date:** [April 17, 2016, 8:31am UTC](https://discuss.elastic.co/t/combining-many-field-as-json-and-made-it-into-a-single-field-performancecombining-many-field-as-json-and-made-it-into-a-single-field-performance/47577/1 "2016-04-17T08:31:28Z")

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I tried to combine multiple different fields (Stored Fields) into a JSON object and added in to lucene document as single field I get a better performance while reading the field from the index. though constructing the JSON requires additional time, It still retrieve the data faster What is the reason for this ?

I done update reading and indexing the data while reading I convert them back to single fields from JSON object

 ![](https://us1.discourse-cdn.com/elastic/original/2X/e/e4d91d600a67cf46712d678f76f4511c31d1b8b9.png)

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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:** [July 5, 2017, 10:58pm UTC](https://discuss.elastic.co/t/combining-many-field-as-json-and-made-it-into-a-single-field-performancecombining-many-field-as-json-and-made-it-into-a-single-field-performance/47577/2 "2017-07-05T22:58:44Z")

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