Indexing lifecycle
The versioning scheme used is x.y.z, where a change in y constitutes major release; if only z changes, this is minor release.
Just install the new version (and deploy the web application), add/change indexer/configuration options (if any) and continue.
This usually means that index version changed which means the data need to be reindexed from scratch. To do so, delete everything under data root and run the indexer. Usually, this is costly operation in terms of time.
