opensearch-project#20 Updating readme for ways to send query data to …

…OpenSearch.

Signed-off-by: jzonthemtn <[email protected]>

README.md

@@ -20,8 +20,9 @@ For details on the JSON Schema used by UBI to send and receive queries and event
 
 ## UBI, Data Prepper, and Open Telemetry
 
-The UBI plugin can store UBI query data in one of two ways:
+The UBI plugin can store UBI query data in one of three ways:
 
+- By directly indexing the UBI query data in the `ubi_queries` index in the same OpenSearch cluster as the plugin.
 - By sending the UBI query data as JSON to a Data Prepper [http](https://opensearch.org/docs/latest/data-prepper/pipelines/configuration/sources/http/) source. The Data Prepper endpoint is provided via the `ubi.dataprepper.url` setting.
 - By sending the UBI query data as Open Telemetry traces. This utilizes the native OpenSearch OTel capabilities which are exposed via the `TelemetryAwarePlugin` interface. As UBI queries are received, trace events will be generated. OpenSearch must be configured as described in [Distributed tracing](https://opensearch.org/docs/latest/observing-your-data/trace/distributed-tracing/) for the events to be sent.