# Null\_value for old values **URL:** \ **Category:** Elasticsearch\ **Created:** [May 21, 2012, 3:24pm UTC](https://discuss.elastic.co/t/null-value-for-old-values/7787 "2012-05-21T15:24:03Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Yehuda\_Zargarov](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yehuda_zargarov/32/2164_2.png) [@Yehuda\_Zargarov](https://discuss.elastic.co/u/Yehuda_Zargarov)\ **Post date:** [May 21, 2012, 3:24pm UTC](https://discuss.elastic.co/t/null-value-for-old-values/7787/1 "2012-05-21T15:24:03Z")
Hi, I've extended an existing schema with a new field. I added "null\_value":-1 to the mapping. Should I be able to search for old data with the null value (with -1)? or does it only applies to new data? Thanks, Yehuda ---
**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\ **Post date:** [May 23, 2012, 9:36pm UTC](https://discuss.elastic.co/t/null-value-for-old-values/7787/2 "2012-05-23T21:36:27Z")
It only applies to new data, though note that null\_value only applied when a json null is provided. If there isn't a null\_value, you can use missing filter, which will also match on old data (since old data doesn't have hte field). On Mon, May 21, 2012 at 5:24 PM, Yehuda Zargarov [yz1583@gmail.com](mailto:yz1583@gmail.com) wrote: > Hi, > > I've extended an existing schema with a new field. > I added "null\_value":-1 to the mapping. > > Should I be able to search for old data with the null value (with -1)? or > does it only applies to new data? > > Thanks, > > Yehuda ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 3:27am UTC](https://discuss.elastic.co/t/null-value-for-old-values/7787/3 "2017-07-06T03:27:28Z")
Closed on July 6, 2017, 3:27am UTC