# Eager loading fields

**URL:** https://discuss.elastic.co/t/eager-loading-fields/38922
**Category:** Elasticsearch
**Created:** [January 11, 2016, 10:19pm UTC](https://discuss.elastic.co/t/eager-loading-fields/38922 "2016-01-11T22:19:58Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![ycunc](https://avatars.discourse-cdn.com/v4/letter/y/dec6dc/32.png) [@ycunc](https://discuss.elastic.co/u/ycunc)
#### Post date: [January 11, 2016, 10:19pm UTC](https://discuss.elastic.co/t/eager-loading-fields/38922/1 "2016-01-11T22:19:58Z")

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I have a quick question about eager loading fields. How do I know if I need to eagerly load one field? If I need to use that field in native reranking scripts, I am sure I need to preload it. But what happens if I need to query that field (e.g. fulltext), and maybe doing some reranking based on query language? Do I need to preload these fields? Also, for gps filtering or time filtering, do I need to preload these fields? or are they already preloaded?

Thanks!

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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, 11:25pm UTC](https://discuss.elastic.co/t/eager-loading-fields/38922/2 "2017-07-05T23:25:22Z")

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