fix: GH-3690, enhance RedisVectorStore with RedisVectorStoreBuilderCustomizer, add generic VectorStore.Builder customizer interface and Redis-specific customizer interface

Author: lanpf

auto-configurations/vector-stores/spring-ai-autoconfigure-vector-store-redis/src/main/java/org/springframework/ai/vectorstore/redis/autoconfigure/RedisVectorStoreAutoConfiguration.java

@@ -28,6 +28,7 @@
 import org.springframework.ai.vectorstore.SpringAIVectorStoreTypes;
 import org.springframework.ai.vectorstore.observation.VectorStoreObservationConvention;
 import org.springframework.ai.vectorstore.redis.RedisVectorStore;
+import org.springframework.ai.vectorstore.redis.RedisVectorStoreBuilderCustomizer;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
@@ -46,6 +47,7 @@
  * @author Eddú Meléndez
  * @author Soby Chacko
  * @author Jihoon Kim
+ * @author Pengfei Lan
  */
 @AutoConfiguration(after = RedisAutoConfiguration.class)
 @ConditionalOnClass({ JedisPooled.class, JedisConnectionFactory.class, RedisVectorStore.class, EmbeddingModel.class })
@@ -63,22 +65,29 @@ BatchingStrategy batchingStrategy() {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public RedisVectorStore vectorStore(EmbeddingModel embeddingModel, RedisVectorStoreProperties properties,
+	public RedisVectorStore.Builder vectorStoreBuilder(EmbeddingModel embeddingModel, RedisVectorStoreProperties properties,
 			JedisConnectionFactory jedisConnectionFactory, ObjectProvider<ObservationRegistry> observationRegistry,
 			ObjectProvider<VectorStoreObservationConvention> customObservationConvention,
-			BatchingStrategy batchingStrategy) {
+			BatchingStrategy batchingStrategy, ObjectProvider<RedisVectorStoreBuilderCustomizer> vectorStoreBuilderCustomizers) {
 
 		JedisPooled jedisPooled = this.jedisPooled(jedisConnectionFactory);
-		return RedisVectorStore.builder(jedisPooled, embeddingModel)
+		RedisVectorStore.Builder builder = RedisVectorStore.builder(jedisPooled, embeddingModel)
 			.initializeSchema(properties.isInitializeSchema())
 			.observationRegistry(observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP))
 			.customObservationConvention(customObservationConvention.getIfAvailable(() -> null))
 			.batchingStrategy(batchingStrategy)
 			.indexName(properties.getIndexName())
-			.prefix(properties.getPrefix())
-			.build();
+			.prefix(properties.getPrefix());
+		vectorStoreBuilderCustomizers.orderedStream().forEach(customizer -> customizer.customize(builder));
+        return builder;
 	}
 
+    @Bean
+    @ConditionalOnMissingBean
+    public RedisVectorStore vectorStore(RedisVectorStore.Builder vectorStoreBuilder) {
+        return vectorStoreBuilder.build();
+    }
+
 	private JedisPooled jedisPooled(JedisConnectionFactory jedisConnectionFactory) {
 
 		String host = jedisConnectionFactory.getHostName();

auto-configurations/vector-stores/spring-ai-autoconfigure-vector-store-redis/src/test/java/org/springframework/ai/vectorstore/redis/autoconfigure/RedisVectorStoreAutoConfigurationIT.java

@@ -35,6 +35,7 @@
 import org.springframework.ai.vectorstore.VectorStore;
 import org.springframework.ai.vectorstore.observation.VectorStoreObservationContext;
 import org.springframework.ai.vectorstore.redis.RedisVectorStore;
+import org.springframework.ai.vectorstore.redis.RedisVectorStoreBuilderCustomizer;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
@@ -49,6 +50,7 @@
  * @author Soby Chacko
  * @author Christian Tzolov
  * @author Thomas Vitale
+ * @author Dongha Koo
  */
 @Testcontainers
 class RedisVectorStoreAutoConfigurationIT {
@@ -134,6 +136,18 @@ public void autoConfigurationEnabledWhenTypeIsRedis() {
 		});
 	}
 
+	@Test
+	void customizerShouldApplyMetadataField() {
+		this.contextRunner
+			.withBean(RedisVectorStoreBuilderCustomizer.class,
+					() -> builder -> builder.metadataFields(RedisVectorStore.MetadataField.tag("customField")))
+			.run(context -> {
+				RedisVectorStore vectorStore = context.getBean(RedisVectorStore.class);
+				List<RedisVectorStore.MetadataField> metadataFields = vectorStore.getMetadataFields();
+				assertThat(metadataFields).extracting(RedisVectorStore.MetadataField::name).contains("customField");
+			});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class Config {
 

spring-ai-vector-store/src/main/java/org/springframework/ai/vectorstore/VectorStoreBuilderCustomizer.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.vectorstore;
+
+/**
+ * Callback interface for customizing {@link VectorStore.Builder} instances.
+ * <p>
+ * Implemented by Spring beans that wish to configure {@code VectorStore} builders
+ * before they are constructed. Customizers are applied in declaration order
+ * (or priority order if {@link org.springframework.core.Ordered} is implemented),
+ * allowing incremental builder configuration while preserving auto-configuration.
+ *
+ * <h3>Typical Use Cases</h3>
+ * <ul>
+ *   <li>Adding custom metadata fields to vector stores</li>
+ *   <li>Configuring observation behaviors</li>
+ * </ul>
+ *
+ * @param <T> the specific type of {@link VectorStore.Builder} being customized
+ * @author Pengfei Lan
+ * @see VectorStore
+ * @see VectorStore.Builder
+ * @see org.springframework.core.Ordered
+ */
+@FunctionalInterface
+public interface VectorStoreBuilderCustomizer<T extends VectorStore.Builder<T>> {
+
+	/**
+	 * Customizes the given {@link VectorStore.Builder} instance.
+	 * @param builder the builder to configure (never {@code null})
+	 */
+	void customize(T builder);
+}

vector-stores/spring-ai-redis-store/src/main/java/org/springframework/ai/vectorstore/redis/RedisVectorStore.java

@@ -169,12 +169,21 @@
  * <li>NUMERIC: For range queries on numerical data</li>
  * </ul>
  *
+ * <p>
+ * Introspection:
+ * </p>
+ * <ul>
+ * <li>{@link #getMetadataFields()} can be used to inspect which metadata fields are
+ * registered in the store.</li>
+ * </ul>
+ *
  * @author Julien Ruaux
  * @author Christian Tzolov
  * @author Eddú Meléndez
  * @author Thomas Vitale
  * @author Soby Chacko
  * @author Jihoon Kim
+ * @author Dongha Koo
  * @see VectorStore
  * @see EmbeddingModel
  * @since 1.0.0
@@ -471,6 +480,14 @@ public <T> Optional<T> getNativeClient() {
 		return Optional.of(client);
 	}
 
+	/**
+	 * Returns the metadata fields used by this RedisVectorStore.
+	 * @return list of configured metadata fields
+	 */
+	public List<MetadataField> getMetadataFields() {
+		return this.metadataFields;
+	}
+
 	public static Builder builder(JedisPooled jedis, EmbeddingModel embeddingModel) {
 		return new Builder(jedis, embeddingModel);
 	}

vector-stores/spring-ai-redis-store/src/main/java/org/springframework/ai/vectorstore/redis/RedisVectorStoreBuilderCustomizer.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.ai.vectorstore.redis;
+
+import org.springframework.ai.vectorstore.VectorStore;
+import org.springframework.ai.vectorstore.VectorStoreBuilderCustomizer;
+
+/**
+ * Customizer interface for {@link RedisVectorStore.Builder} configuration.
+ * <p>
+ * Allows customization of Redis-based {@link VectorStore} configuration while preserving
+ * default auto-configuration. Implementations can add additional settings or modify
+ * existing ones without overriding the entire configuration.
+ *
+ * <h3>Usage Example</h3>
+ * The following example shows how to add custom metadata fields:
+ * <pre>{@code
+ * @Bean
+ * public RedisVectorStoreBuilderCustomizer metadataCustomizer() {
+ *     return builder -> builder.metadataFields(
+ *         List.of(RedisVectorStore.MetadataField.tag("conversationId"))
+ *     );
+ * }
+ * }</pre>
+ *
+ * @author Pengfei Lan
+ * @see RedisVectorStore
+ * @see VectorStore
+ */
+public interface RedisVectorStoreBuilderCustomizer extends VectorStoreBuilderCustomizer<RedisVectorStore.Builder> {
+
+}

vector-stores/spring-ai-redis-store/src/test/java/org/springframework/ai/vectorstore/redis/RedisVectorStoreIT.java

@@ -59,6 +59,7 @@
  * @author Eddú Meléndez
  * @author Thomas Vitale
  * @author Soby Chacko
+ * @author Dongha Koo
  */
 @Testcontainers
 class RedisVectorStoreIT extends BaseVectorStoreTests {
@@ -316,6 +317,18 @@ void getNativeClientTest() {
 		});
 	}
 
+	@Test
+	void customizerShouldBeAppliedToBuilder() {
+		this.contextRunner
+			.withBean(RedisVectorStoreBuilderCustomizer.class,
+					() -> builder -> builder.metadataFields(MetadataField.tag("customField")))
+			.run(context -> {
+				RedisVectorStore vectorStore = context.getBean(RedisVectorStore.class);
+				List<MetadataField> metadataFields = vectorStore.getMetadataFields();
+				assertThat(metadataFields).extracting(MetadataField::name).contains("customField");
+			});
+	}
+
 	@SpringBootConfiguration
 	@EnableAutoConfiguration(exclude = { DataSourceAutoConfiguration.class })
 	public static class TestApplication {