# Filter on string field in last N documents then get min value

**URL:** <https://discuss.elastic.co/t/filter-on-string-field-in-last-n-documents-then-get-min-value/188119>\
**Category:** Kibana\
**Created:** [June 29, 2019, 3:44am UTC](https://discuss.elastic.co/t/filter-on-string-field-in-last-n-documents-then-get-min-value/188119 "2019-06-29T03:44:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rcodestuff](https://avatars.discourse-cdn.com/v4/letter/r/839c29/32.png) [@rcodestuff](https://discuss.elastic.co/u/rcodestuff)\
**Post date:** [June 29, 2019, 3:44am UTC](https://discuss.elastic.co/t/filter-on-string-field-in-last-n-documents-then-get-min-value/188119/1 "2019-06-29T03:44:28Z")

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Hi All,  
I have index docs in format:

```
{
myCategory: "A"
myValue"10"
}
{
myCategory: "B"
myValue"20"
}
{
myCategory: "A"
myValue"14"
}
...

```

Was looking for a way to do the following metric visualization --\> get the minimum myValue from the latest 3 documents which has myCategory value as "A". And if that minimum value is \>10 display metric in red font.

Any suggestions.  
Thanks

---

<div class="post-metadata">

**Author:** ![Larry\_Gregory](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/larry_gregory/32/34969_2.png) [@Larry\_Gregory](https://discuss.elastic.co/u/Larry_Gregory)\
**Post date:** [July 1, 2019, 12:56pm UTC](https://discuss.elastic.co/t/filter-on-string-field-in-last-n-documents-then-get-min-value/188119/2 "2019-07-01T12:56:09Z")

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@rcodestuff,

You can create the metric visualization with a filter which queries for the most recent entries:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/3/6/36426acf46adaf0fc5d982cfc236568b5c98d142.png)

```auto
{
  "query": {
    "match": {
      "myCategory.keyword": "A"
    }
  },
  "sort": [
    {
      "@timestamp": {
        "order": "desc"
      }
    }
  ],
  "size": 3
}

```

Once the filter is in place, then you can specify that you want the "Min" metric for "myValue":

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/1/5/15ded608d69e961866889ba6bd45ec8f70a07dfa.png)

Finally, in the options tab, you can specify a color range, so that the value turns red when \< 10:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/1/8/1840a986737ebf0eec10c7752fca9ec1d88f2364.png)

---

<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:** [July 29, 2019, 12:56pm UTC](https://discuss.elastic.co/t/filter-on-string-field-in-last-n-documents-then-get-min-value/188119/3 "2019-07-29T12:56:14Z")

</div>

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