# How I can drop anyone fields if a value in this field contains "null"?

**URL:** <https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543>\
**Category:** Logstash\
**Created:** [November 29, 2017, 9:06am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543 "2017-11-29T09:06:42Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![srolskyi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/srolskyi/32/24788_2.png) [@srolskyi](https://discuss.elastic.co/u/srolskyi)\
**Post date:** [November 29, 2017, 9:06am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543/1 "2017-11-29T09:06:42Z")

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How I can drop anyone fields if a value in this field contains "null"?  
I use plugins kv, xml, and json sometimes value in the field = null. I need a flexible solution, that so as not to describe each field separately.  
Example:  
["user"=null&"node"="server1"&"proxy"=true&"id"=null]

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [November 29, 2017, 9:45am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543/2 "2017-11-29T09:45:47Z")

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Use the prune filter?

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<div class="post-metadata">

**Author:** ![srolskyi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/srolskyi/32/24788_2.png) [@srolskyi](https://discuss.elastic.co/u/srolskyi)\
**Post date:** [November 29, 2017, 10:34am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543/3 "2017-11-29T10:34:27Z")

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Yes, but (Value type is hash)  
I need set each key

```
prune {
    blacklist_values => [ "user", "null",
                          "id", "null",
                          "node", "null" ]
  }
```

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<div class="post-metadata">

**Author:** ![srolskyi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/srolskyi/32/24788_2.png) [@srolskyi](https://discuss.elastic.co/u/srolskyi)\
**Post date:** [November 29, 2017, 10:40am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543/4 "2017-11-29T10:40:52Z")

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I search flexible solution because I have ~10-15 key in each pattern..

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<div class="post-metadata">

**Author:** ![srolskyi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/srolskyi/32/24788_2.png) [@srolskyi](https://discuss.elastic.co/u/srolskyi)\
**Post date:** [November 29, 2017, 11:28am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543/5 "2017-11-29T11:28:16Z")

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If I try:

```
 prune {
                                        blacklist_values => [".*", "null"]
                              }

```

this does not work...

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 27, 2017, 11:28am UTC](https://discuss.elastic.co/t/how-i-can-drop-anyone-fields-if-a-value-in-this-field-contains-null/109543/6 "2017-12-27T11:28:57Z")

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