Search Relevance refers to the accuracy of the results provided by the Search application in response to a user query. It is a measure of the performance of the search application. SearchAssist provides various configuration properties like weightage, synonyms, search relevance, etc. that you can fine-tune as per your business needs and return the most relevant results to your users. 

To manage the relevance-related parameters of your SearchAssist application, go to the Search Settings under the Indices tab.