filter property
Applies a strict filter to the search results used to ground the answer.
The expression supports a subset of the syntax described at
https://google.aip.dev/160. Supported fields for filtering: *
content_length_bytes (INTEGER): The length of the Document.content
field in bytes. * data_source (STRING): The source of the document, e.g.
docs.cloud.google.com. See
https://developers.google.com/knowledge/reference/corpus-reference for the
complete list of data sources in the corpus. * update_time (TIMESTAMP):
The timestamp of when the document was last meaningfully updated. A
meaningful update is one that changes document's markdown content or
metadata. * uri (STRING): The document URI, e.g.
https://docs.cloud.google.com/bigquery/docs/tables. INTEGER fields
support =, <, <=, >, and >= operators. STRING fields support =
(equals) and != (not equals) operators for exact match on the whole
string. Partial match, prefix match, and regexp match are not supported.
TIMESTAMP fields support =, <, <=, >, and >= operators.
Timestamps must be in RFC-3339 format, e.g., "2025-01-01T00:00:00Z". You
can combine expressions using AND, OR, and NOT (or -) logical
operators. OR has higher precedence than AND. Use parentheses for
explicit precedence grouping. Examples: * Filter by
Document.content_length_bytes: content_length_bytes < 50000 *
data_source = "docs.cloud.google.com" OR data_source = "firebase.google.com" * data_source != "firebase.google.com" *
update_time < "2024-01-01T00:00:00Z" * update_time >= "2025-01-22T00:00:00Z" AND (data_source = "developer.chrome.com" OR data_source = "web.dev") * uri = "https://docs.cloud.google.com/release-notes" The filter string must
not exceed 500 characters; values longer than 500 characters will result
in an INVALID_ARGUMENT error.
Optional.
Implementation
core.String? filter;