Consolidation is very helpful for incremental indexing, to take updates as they come instead of rebuilding the entire index when an object changes.
The incremental update is a complex task as it requires calculating the impact of any changes and building complete documents according to projection rules.
Note: The Exalead CloudView Consolidation Server is not limited to one data source. It can work across several data sources, which allows building documents based on objects coming from different sources. This avoids having an ETL or an equivalent tool to perform cross-source joins and aggregations.
For more information, see the Exalead CloudView Consolidation Server Guide.