Vertex AI Search adds new query filtering capabilities

Agent Search: Prefix and partial matching for filtering search queries (Preview) You can configure schema fields to support prefix matching and partial matching in filter expressions: Prefix matching lets you filter search results based on whether a field value starts with a specific string. Partial matching lets you filter results based on whether the query contains some of the words in the field value. Partial matching doesn't require a perfect match like the ANY operator does. This feature is in Public Preview. For more information, see Configure field settings .

Agent Search: EXISTS filter for filtering search queries (Preview) You can use the EXISTS filter to filter search results for documents. Specifying EXISTS for a field means that a document can only be returned in a search request if the field has a value and that value is not the default. This filter is available for custom search and for media search. Use EXISTS with other filters such as ANY and IN to create expressions to scope the documents that can be returned in a search query. This feature is in Public Preview. For more information, see Filter custom search for structured or unstructure