15.5.4. Rebuilding the Index

The Lucene index can be rebuilt, if required, by reconstructing it from the data store in the cache.

The index must be rebuilt if:

The definition of what is indexed in the types has changed.
A parameter affecting how the index is defined, such as the Analyser changes.
The index is destroyed or corrupted, possibly due to a system administration error.

To rebuild the index, obtain a reference to the MassIndexer and start it as follows:

SearchManager searchManager = Search.getSearchManager(cache);
searchManager.getMassIndexer().start();

This operation reprocesses all data in the grid, and therefore may take some time.

Rebuilding the index is also available as a JMX operation.

Note

The MassIndexer is implemented using MapReduce, and is therefore only functional in distributed cache mode.