Assets Server uses Elasticsearch to search over its assets, and Elasticsearch uses analyzers to break up query strings and / or indexed (analyzed) fields of its documents.
Creating a custom setup
It is also possible to create a custom Elasticsearch Analyzer setup.
Because this is a highly complex process, please ask your WoodWing Partner to contact WoodWing Support for assistance.
Note: If you are looking for information about assigning existing analyzers to custom metadata fields, see The metadata structure of Assets Server.