> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Pipeline Stages

export const LwTemplate = ({title = "Key questions to get you started", icon = "sparkles", cta = "Powered by Agent Studio", linkHref = "https://lucidworks.com/demo/?utm_source=docs&utm_medium=referral&utm_campaign=docs_cta_ai"}) => {
  const [isLoaded, setIsLoaded] = useState(false);
  useEffect(() => {
    const timer = setTimeout(() => {
      setIsLoaded(true);
    }, 500);
    return () => clearTimeout(timer);
  }, []);
  return <div className="lw-template-container">
      <Card title={title} icon={icon}>
        {isLoaded && <span dangerouslySetInnerHTML={{
    __html: `<lw-template id="a029c1a9-28be-427e-b0e1-5d918920246a"></lw-template
            >`
  }} />}
        <Link href={linkHref} className="agent-studio-link text-left text-gray-600 gap-2 dark:text-gray-400 text-sm font-medium flex flex-row items-center hover:text-primary dark:hover:text-primary-light group-hover:text-primary group-hover:dark:text-primary-light">Powered by Lucidworks Agent Studio</Link>
      </Card>
    </div>;
};

[localhost link]: http://localhost:3000/docs/4/fusion-server/reference/pipeline-stages/overview

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-server/reference/pipeline-stages/overview

[old doc.lw link]: https://doc.lucidworks.com/fusion/5.9/203

Index Pipeline stages are used to create and modify PipelineDocument objects.

Query Pipeline stages are used to modify Request objects
and Response objects.

<LwTemplate />

## Pipeline Stage Properties

Fusion associates a pipeline stage definition with a unique ID and stores the definition so that stages can be reused across pipelines and applications.
In addition to an ID, all stages have the following properties:

* **type** (required): an enumeration, one of the defined Fusion pipeline stage types, e.g., "index-logging". If the Fusion UI is used to define the stage, this property is filled in automatically.
* **label** (optional) : a string field with a maximum length of 255 characters. The label is displayed on the Fusion UI.
* **skip** (optional): a boolean value, If true, pipeline processing bypasses this stage altogether. The default is **false**.
* **condition** (optional): a JavaScript expression that evaluates to true (1) or false (0).\
  If this condition evaluates to false, this stage is skipped. The default is **true**.

## Pipeline Condition Expression

The JavaScript expression specified in the condition property of a pipeline stage has access the pipeline objects.

### Index Pipeline Stage Condition Example

An index PipelineDocument has two available variables: "doc" and "ctx".

Check whether pipeline document contains a named field:

```js wrap  theme={"dark"}
doc.hasField("acl_ss")
```

### Query pipeline stage Condition Example

Process query based the query Request object:

```js wrap  theme={"dark"}
request.hasParam("fusion-user-name") && request.getFirstParam("fusion-user-name").equals("SuperUser");
!request.hasParam("isFusionPluginQuery")
```

The first condition checks that the request parameter "fusion-user-name" is present and has the value "SuperUser".
The second condition checks that the request parameter "isFusionPluginQuery" is not present.