---
title: A brief Painless walkthrough
description: To illustrate how Painless works, let’s load some hockey stats into an Elasticsearch index: With the hockey data ingested, try out some basic operations...
url: https://www.elastic.co/elastic/docs-builder/docs/3016/reference/scripting-languages/painless/brief-painless-walkthrough
products:
  - Elasticsearch
  - Painless
applies_to:
  - Elastic Cloud Serverless: Generally available
  - Elastic Stack: Generally available
---

# A brief Painless walkthrough
<tip>
  This walkthrough is designed for users experienced with scripting and already familiar with Painless, who need direct access to Painless specifications and advanced features.
</tip>

To illustrate how Painless works, let’s load some hockey stats into an Elasticsearch index:
```json

{"index":{"_id":1}}
{"first":"johnny","last":"gaudreau","goals":[9,27,1],"assists":[17,46,0],"gp":[26,82,1],"born":"1993/08/13"}
{"index":{"_id":2}}
{"first":"sean","last":"monohan","goals":[7,54,26],"assists":[11,26,13],"gp":[26,82,82],"born":"1994/10/12"}
{"index":{"_id":3}}
{"first":"jiri","last":"hudler","goals":[5,34,36],"assists":[11,62,42],"gp":[24,80,79],"born":"1984/01/04"}
{"index":{"_id":4}}
{"first":"micheal","last":"frolik","goals":[4,6,15],"assists":[8,23,15],"gp":[26,82,82],"born":"1988/02/17"}
{"index":{"_id":5}}
{"first":"sam","last":"bennett","goals":[5,0,0],"assists":[8,1,0],"gp":[26,1,0],"born":"1996/06/20"}
{"index":{"_id":6}}
{"first":"dennis","last":"wideman","goals":[0,26,15],"assists":[11,30,24],"gp":[26,81,82],"born":"1983/03/20"}
{"index":{"_id":7}}
{"first":"david","last":"jones","goals":[7,19,5],"assists":[3,17,4],"gp":[26,45,34],"born":"1984/08/10"}
{"index":{"_id":8}}
{"first":"tj","last":"brodie","goals":[2,14,7],"assists":[8,42,30],"gp":[26,82,82],"born":"1990/06/07"}
{"index":{"_id":39}}
{"first":"mark","last":"giordano","goals":[6,30,15],"assists":[3,30,24],"gp":[26,60,63],"born":"1983/10/03"}
{"index":{"_id":10}}
{"first":"mikael","last":"backlund","goals":[3,15,13],"assists":[6,24,18],"gp":[26,82,82],"born":"1989/03/17"}
{"index":{"_id":11}}
{"first":"joe","last":"colborne","goals":[3,18,13],"assists":[6,20,24],"gp":[26,67,82],"born":"1990/01/30"}
```

With the hockey data ingested, try out some basic operations that you can do in Painless:
- [Accessing Doc Values from Painless](https://www.elastic.co/elastic/docs-builder/docs/3016/reference/scripting-languages/painless/painless-walkthrough-access-doc-values)
- [Missing keys or values](https://www.elastic.co/elastic/docs-builder/docs/3016/reference/scripting-languages/painless/painless-walkthrough-missing-keys-or-values)
- [Updating Fields with Painless](https://www.elastic.co/elastic/docs-builder/docs/3016/reference/scripting-languages/painless/painless-walkthrough-updating-fields)
- [Dates](https://www.elastic.co/elastic/docs-builder/docs/3016/reference/scripting-languages/painless/painless-walkthrough-dates)
- [Regular expressions](https://www.elastic.co/elastic/docs-builder/docs/3016/reference/scripting-languages/painless/painless-walkthrough-regular-expressions)