Query Expansion Service

With the Query Expansion Service the user receives a search term expanded with synonyms based on the search query. In addition, the search term can be enhanced qualitatively by importing an ontology.


Technical specification:

  • Operating systems
  • Windows Server 2008 R2 or higher and Linux
  • Installation requirements
  • Java 7
  • Supported formats
  • CSV format
  • SKOS format
  • TURTLE format

Combinable services:

  • The Thesaurus Service is upstream of the Search Service
  • All other services and plug-ins can be combined orthogonally in a pipeline


  • SOA documentation
  • Thesaurus user manual
  • Sample implementation in Java is provided
  • Demo directory with simple click-and-play usage examples

The service is interesting for:

  • Companies that need to access the content of their documents and have the highest demands for reliability and load distribution by horizontal scaling
  • Embedding partner
  • Elasticsearch developers
  • Solr developers