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## indexing


Contained in [field](https://docs.vespa.ai/en/reference/schema-reference.html#field) or
[struct-field](https://docs.vespa.ai/en/reference/schema-reference.html#struct-field).
One or more Indexing Language instructions used to produce index, attribute
and summary data from this field. Indexing instructions has pipeline
semantics similar to unix shell commands. The value of the field
enters the pipeline during indexing and the pipeline puts the value
into the desired index structures, possibly doing transformations and
pulling in other values along the way.
```
indexing: [index-statement]
``` 

or
```
indexing {
    [indexing-statement];
    [indexing-statement];
    …
}
``` 


If the field containing this is defined outside the document, it
must start by an indexing statement which
outputs a value (either "input [fieldname]" to fetch a field value,
or a literal, e.g "some-value" ). Fields in documents will use the value of the enclosing
field as input (input [fieldname]) if one isn't explicitly provided.


Specify the operations separated by the pipe (`|`) character.
For advanced processing needs,
use the [indexing language](https://docs.vespa.ai/en/reference/indexing-language-reference.html),
or write a [ document processor](https://docs.vespa.ai/en/document-processing.html).
Supported expressions for fields are:


[Read more](https://docs.vespa.ai/en/reference/schema-reference.html#indexing)