# Vega Visualization with nested Hashes
**URL:** https://discuss.elastic.co/t/vega-visualization-with-nested-hashes/274604
**Category:** Elasticsearch
**Tags:** vega
**Created:** [June 1, 2021, 9:28am UTC](https://discuss.elastic.co/t/vega-visualization-with-nested-hashes/274604 "2021-06-01T09:28:46Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@etot94](https://discuss.elastic.co/u/etot94)
#### Post date: [June 1, 2021, 9:28am UTC](https://discuss.elastic.co/t/vega-visualization-with-nested-hashes/274604/1 "2021-06-01T09:28:46Z")
Hello ES Team. 🙂
I would like to visualize my data from ES with Vega-lite.
My fields are:
**data\_field** which is an array of nested hashes.
**data\_number** which is just a number representing each of the **data\_field**
**My Example:**
**number** : 4
**data\_field** :
```
{
"data": [
{
"val": 824.924,
"string": "important"
},
{
"val": 12.23,
"string": "not_important"
}
],
"element": "first",
},
{
"data": [
{
"val": 123.456,
"string": "important"
},
{
"val": 12.23,
"string": "not_important"
}
],
"element": "second",
}
```
**My Goal:**
I would like to create a Visualization with Vega Lite.
Is it possible to get the field **number** on the x Axis..
and from **my\_data** **the first** value of **val** on the y Axis\*\*?
```
^
|
|
val | .
| . . .
| . .
| _______________________________________ >
1 2 3 4 5 6
number
```
**My Problem:**
I am not sure which aggregation I should use, to get only the first **num** value of my Data.
I would need something like the max aggregation, which returns me one of those values.. but I need not the bigger one, but the first.
Can some help me with that? 🙂
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 29, 2021, 9:29am UTC](https://discuss.elastic.co/t/vega-visualization-with-nested-hashes/274604/2 "2021-06-29T09:29:10Z")
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