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The DDB Solr uses a few own implementations of solr add-ons. They are currently developed as part of the DDB Backend project and bundled in a single Jar file that is copied to the Solr libs directory at installation.

NewspaperSearchHandler

A custom SearchHandler implementation that was developed to handle the hierarchical data stored in the newspaper-issues index.

Source:
https://dev.fiz-karlsruhe.de/stash/projects/DDB/repos/ddb-backend/browse/SolrIndexServer/src/main/java/de/fiz/ddb/solr/searchhandler/NewspaperSearchHandler.java

LocationGroupingComponent

A custom search component that was developed for the newspaper-index. When activated it duplicates entries that have more than one location entry and then sorts the result by location. A second custom component (LocationGroupingSupportComponent) is required at the beginning of the component chain to support rows and start parameters.

Sources:
https://dev.fiz-karlsruhe.de/stash/projects/DDB/repos/ddb-backend/browse/SolrIndexServer/src/main/java/de/fiz/ddb/solr/searchcomponents/LocationGroupingComponent.java?at=develop
https://dev.fiz-karlsruhe.de/stash/projects/DDB/repos/ddb-backend/browse/SolrIndexServer/src/main/java/de/fiz/ddb/solr/searchcomponents/LocationGroupingSupportComponent.java?at=develop