feat: add lite search API to allow public website search with API key (…

…#27495)

feat: add LOW_GROUNDED_ANSWER in answer skip reasons
feat: support query regex in control match rules
docs: keep the API doc up-to-date with recent changes
chore: add selective gapic generation option for publishing

google-cloud-discovery_engine-v1/.owlbot-manifest.json

@@ -292,6 +292,7 @@
     "snippets/schema_service/list_schemas.rb",
     "snippets/schema_service/update_schema.rb",
     "snippets/search_service/search.rb",
+    "snippets/search_service/search_lite.rb",
     "snippets/search_tuning_service/list_custom_models.rb",
     "snippets/search_tuning_service/train_custom_model.rb",
     "snippets/site_search_engine_service/batch_create_target_sites.rb",

google-cloud-discovery_engine-v1/gapic_metadata.json

@@ -82,6 +82,11 @@
               "methods": [
                 "search"
               ]
+            },
+            "SearchLite": {
+              "methods": [
+                "search_lite"
+              ]
             }
           }
         }

google-cloud-discovery_engine-v1/lib/google/cloud/discovery_engine/v1/search_service/rest/service_stub.rb

@@ -99,6 +99,44 @@ def search request_pb, options = nil
                 result
               end
 
+              ##
+              # Baseline implementation for the search_lite REST call
+              #
+              # @param request_pb [::Google::Cloud::DiscoveryEngine::V1::SearchRequest]
+              #   A request object representing the call parameters. Required.
+              # @param options [::Gapic::CallOptions]
+              #   Overrides the default settings for this call, e.g, timeout, retries etc. Optional.
+              #
+              # @yield [result, operation] Access the result along with the TransportOperation object
+              # @yieldparam result [::Google::Cloud::DiscoveryEngine::V1::SearchResponse]
+              # @yieldparam operation [::Gapic::Rest::TransportOperation]
+              #
+              # @return [::Google::Cloud::DiscoveryEngine::V1::SearchResponse]
+              #   A result object deserialized from the server's reply
+              def search_lite request_pb, options = nil
+                raise ::ArgumentError, "request must be provided" if request_pb.nil?
+
+                verb, uri, query_string_params, body = ServiceStub.transcode_search_lite_request request_pb
+                query_string_params = if query_string_params.any?
+                                        query_string_params.to_h { |p| p.split "=", 2 }
+                                      else
+                                        {}
+                                      end
+
+                response = @client_stub.make_http_request(
+                  verb,
+                  uri:     uri,
+                  body:    body || "",
+                  params:  query_string_params,
+                  options: options
+                )
+                operation = ::Gapic::Rest::TransportOperation.new response
+                result = ::Google::Cloud::DiscoveryEngine::V1::SearchResponse.decode_json response.body, ignore_unknown_fields: true
+
+                yield result, operation if block_given?
+                result
+              end
+
               ##
               # @private
               #
@@ -136,6 +174,44 @@ def self.transcode_search_request request_pb
                                                         )
                 transcoder.transcode request_pb
               end
+
+              ##
+              # @private
+              #
+              # GRPC transcoding helper method for the search_lite REST call
+              #
+              # @param request_pb [::Google::Cloud::DiscoveryEngine::V1::SearchRequest]
+              #   A request object representing the call parameters. Required.
+              # @return [Array(String, [String, nil], Hash{String => String})]
+              #   Uri, Body, Query string parameters
+              def self.transcode_search_lite_request request_pb
+                transcoder = Gapic::Rest::GrpcTranscoder.new
+                                                        .with_bindings(
+                                                          uri_method: :post,
+                                                          uri_template: "/v1/{serving_config}:searchLite",
+                                                          body: "*",
+                                                          matches: [
+                                                            ["serving_config", %r{^projects/[^/]+/locations/[^/]+/dataStores/[^/]+/servingConfigs/[^/]+/?$}, false]
+                                                          ]
+                                                        )
+                                                        .with_bindings(
+                                                          uri_method: :post,
+                                                          uri_template: "/v1/{serving_config}:searchLite",
+                                                          body: "*",
+                                                          matches: [
+                                                            ["serving_config", %r{^projects/[^/]+/locations/[^/]+/collections/[^/]+/dataStores/[^/]+/servingConfigs/[^/]+/?$}, false]
+                                                          ]
+                                                        )
+                                                        .with_bindings(
+                                                          uri_method: :post,
+                                                          uri_template: "/v1/{serving_config}:searchLite",
+                                                          body: "*",
+                                                          matches: [
+                                                            ["serving_config", %r{^projects/[^/]+/locations/[^/]+/collections/[^/]+/engines/[^/]+/servingConfigs/[^/]+/?$}, false]
+                                                          ]
+                                                        )
+                transcoder.transcode request_pb
+              end
             end
           end
         end