# Siren Federate User Guide

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## Set up Federate

### Configuring logger

It is recommended to change the default Elasticsearch’s log configuration `logger.action.level` from `debug` to `warn` in order to avoid spurious log messages whenever a search request is canceled.

#### JDBC drivers

JDBC driver jars for remote datasources and their dependencies (if any) must be copied to the plugin directory alongside other jars; once the jars have been copied, restart the node and ensure that the node starts correctly.

If the node fails to start because of a JAR Hell exception, remove the driver and its dependencies and restart the node.

#### Impala JDBC connector

The following jars should not be copied as they are already present in the default Elasticsearch path:

- `commons-logging`

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