> ## 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.

# Aggregation Configuration Parameters

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[localhost link]: http://localhost:3000/docs/4/fusion-ai/reference/aggregations/aggregation-config-params

[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-ai/reference/aggregations/aggregation-config-params

[old doc.lw link]: https://doc.lucidworks.com/fusion-ai/4.2/588

<LwTemplate />

## Aggregation configuration parameters

|                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| ------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `groupingFields`   | An array of strings specifying the fields to group on.                                                                                                                                                                                                                                                                                                                                                                                                                             |
| `signalTypes`      | The signal types. If not set then any signal type is selected.                                                                                                                                                                                                                                                                                                                                                                                                                     |
| `selectQuery`      | The query to select the desired signals. If not set then `\*:\*` will be used, or equivalent.                                                                                                                                                                                                                                                                                                                                                                                      |
| `sort`             | The criteria to sort on within a group. If not set then sort order is by ID, ascending.                                                                                                                                                                                                                                                                                                                                                                                            |
| `timeRange`        | The time range to select signals on, e.g., `[* TO NOW]`. See [Solr date range](https://solr.apache.org/guide/8_8/working-with-dates.html) for more options.                                                                                                                                                                                                                                                                                                                        |
| `outputPipeline`   | What pipeline to use to process the output. If not set then `_system` pipeline will be used.                                                                                                                                                                                                                                                                                                                                                                                       |
| `rollupPipeline`   | Pipeline to use for processing results of roll-up. This is by default the same index pipeline used for processing the aggregation results.                                                                                                                                                                                                                                                                                                                                         |
| `rollupAggregator` | The aggregator to use when rolling up. If not set then the same aggregator will be used for roll-up.                                                                                                                                                                                                                                                                                                                                                                               |
| `outputCollection` | The collection to write the aggregates to on output. This property is required if the selected output/rollup pipeline requires it (the default pipeline does). A special value of `-` disables the output.                                                                                                                                                                                                                                                                         |
| `aggregator`       | Aggregator implementation to use. This is either one of the symbolic names (simple, click, em) or a fully-qualified class name of a class extending EventAggregator. If not set then 'simple' is used.                                                                                                                                                                                                                                                                             |
| `sourceRemove`     | If true, the processed source signals will be removed after aggregation. Default is false.                                                                                                                                                                                                                                                                                                                                                                                         |
| `sourceCatchup`    | If true, only aggregate the signals since the last time the job was successfully run. If there is a record of such previous run then this overrides the starting time of time range set in `timeRange` property.                                                                                                                                                                                                                                                                   |
| `outputRollup`     | Roll-up current results with all previous results for this aggregation id, which are available in `outputCollection`.                                                                                                                                                                                                                                                                                                                                                              |
| `aggregates`       | List of functions defining how to aggregate events with results. Aggregation functions have these properties: <br />• `type` The function type defining how to aggregate events with results. <br />• `sourceFields` The fields that the function will read from. <br />• `targetField` The field that the function will write to. <br />• `mapper` When true the function will be used in map phase only. <br />• `parameters` Other parameters specific to individual functions. |
| `statsFields`      | List of numeric fields in results for which to compute overall statistics.                                                                                                                                                                                                                                                                                                                                                                                                         |
| `parameters`       | Other aggregation parameters (such as start / aggregate / finish scripts, cache size, and so on).                                                                                                                                                                                                                                                                                                                                                                                  |