HSEARCH-5021 Remove the array check from a vector DefaultInitiator

integrationtest/mapper/pojo-base/src/test/java/org/hibernate/search/integrationtest/mapper/pojo/mapping/definition/VectorFieldIT.java

@@ -345,15 +345,9 @@ class IndexedEntity {
 				.satisfies( FailureReportUtils.hasFailureReport()
 						.typeContext( IndexedEntity.class.getName() )
 						.pathContext( ".notVector" )
-						.failure(
-								"Unable to apply property mapping: this property mapping must target an index field of vector type",
-								"but the resolved field type is non-vector",
-								"This generally means you need to use a different field annotation"
-										+ " or to convert property values using a custom ValueBridge or ValueBinder",
-								"If you are already using a custom ValueBridge or ValueBinder, check its field type",
-								"encountered type DSL step '",
-								"expected interface '" + VectorFieldTypeOptionsStep.class.getName() + "'"
-						) );
+						// NOTE: this is an exception from the IndexFieldTypeFactory implementation, hence it is backend-specific and in this case
+						// it is from the stub-backend.
+						.failure( "No built-in vector index field type for class: 'java.lang.Integer'." ) );
 	}
 
 	@Test
@@ -371,14 +365,9 @@ class IndexedEntity {
 				.satisfies( FailureReportUtils.hasFailureReport()
 						.typeContext( IndexedEntity.class.getName() )
 						.pathContext( ".bytes" )
-						.failure(
-								"Unable to apply property mapping: this property mapping must target an index field of vector type, but the resolved field type is non-vector",
-								"This generally means you need to use a different field annotation"
-										+ " or to convert property values using a custom ValueBridge or ValueBinder",
-								"If you are already using a custom ValueBridge or ValueBinder, check its field type",
-								"encountered type DSL step '",
-								"expected interface '" + VectorFieldTypeOptionsStep.class.getName() + "'"
-						) );
+						// NOTE: this is an exception from the IndexFieldTypeFactory implementation, hence it is backend-specific and in this case
+						// it is from the stub-backend.
+						.failure( "No built-in vector index field type for class: 'java.lang.Integer'." ) );
 	}
 
 	@Test

mapper/pojo-base/src/main/java/org/hibernate/search/mapper/pojo/mapping/definition/programmatic/impl/PropertyMappingVectorFieldOptionsStepImpl.java

@@ -36,14 +36,7 @@ public <F> IndexFieldTypeOptionsStep<?, F> initiate(IndexFieldTypeFactory factor
 						if ( dimension == null ) {
 							throw log.vectorDimensionNotSpecified();
 						}
-						// we consider arrays (byte[] and float[] in particular to be vector types, anything else will be
-						// treated as a non-vector field and delegated to a regular as(..) call.
-						if ( clazz.isArray() ) {
-							return factory.asVector( dimension, clazz );
-						}
-						else {
-							return factory.as( clazz );
-						}
+						return factory.asVector( dimension, clazz );
 					}
 				},
 				FieldModelContributorContext::vectorTypeOptionsStep );

util/internal/integrationtest/common/src/main/java/org/hibernate/search/util/impl/integrationtest/common/stub/backend/types/dsl/impl/StubIndexFieldTypeFactory.java

@@ -27,6 +27,7 @@
 import org.hibernate.search.engine.backend.types.dsl.VectorFieldTypeOptionsStep;
 import org.hibernate.search.engine.mapper.mapping.building.spi.IndexFieldTypeDefaultsProvider;
 import org.hibernate.search.engine.spatial.GeoPoint;
+import org.hibernate.search.util.common.SearchException;
 
 public class StubIndexFieldTypeFactory implements IndexFieldTypeFactory {
 
@@ -167,7 +168,7 @@ public <F> VectorFieldTypeOptionsStep<?, F> asVector(int dimension, Class<F> val
 		if ( float[].class.equals( valueType ) ) {
 			return (VectorFieldTypeOptionsStep<?, F>) asFloatVector( dimension );
 		}
-		return new StubVectorFieldTypeOptionsStep<>( dimension, valueType );
+		throw new SearchException( "No built-in vector index field type for class: '" + valueType.getName() + "'." );
 	}
 
 	@Override