# Indexer adapters

Since `--outputPrefix` and `--outputDir` flags are both included, the deployment template will override any values specified for the Indexer Adapter "URL" and "Output prefix" properties.

Therefore, it is unnecessary to modify these properties in most cases.

For Agraph deployments, the `PROP_NAME` attribute of the `ROLLOVER` element in your indexer adapter must be specified. It should be set to a property which is the unique identifier for records in your data set. For standard Forge deployments, this element should be specified in the main pipeline. For Parallel Forge deployments, this element should be specified in the data splitter pipeline.

Note: The number of partitions for Agraph deployments need not be set in the pipeline, as the value will be specified as a forge command line argument, overriding the value in the pipeline. However, the rollover key on which data will be partitioned must be specified as described above.