refactor(vectorstore): introduce builder pattern for MilvusVectorStore

- Replace configuration object with fluent builder pattern
- Move Milvus-related classes to dedicated milvus package
- Deprecate MilvusVectorStoreConfig in favor of builder
- Update constructor to use builder internally
- Maintain backward compatibility with deprecated config
- Add comprehensive builder methods with validation

Author: sobychacko

spring-ai-spring-boot-autoconfigure/src/main/java/org/springframework/ai/autoconfigure/vectorstore/milvus/MilvusVectorStoreAutoConfiguration.java

@@ -27,8 +27,8 @@
 import org.springframework.ai.embedding.BatchingStrategy;
 import org.springframework.ai.embedding.EmbeddingModel;
 import org.springframework.ai.embedding.TokenCountBatchingStrategy;
-import org.springframework.ai.vectorstore.MilvusVectorStore;
-import org.springframework.ai.vectorstore.MilvusVectorStore.MilvusVectorStoreConfig;
+import org.springframework.ai.milvus.vectorstore.MilvusVectorStore;
+import org.springframework.ai.milvus.vectorstore.MilvusVectorStore.MilvusVectorStoreConfig;
 import org.springframework.ai.vectorstore.observation.VectorStoreObservationConvention;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
@@ -71,23 +71,13 @@ public MilvusVectorStore vectorStore(MilvusServiceClient milvusClient, Embedding
 			ObjectProvider<ObservationRegistry> observationRegistry,
 			ObjectProvider<VectorStoreObservationConvention> customObservationConvention) {
 
-		MilvusVectorStoreConfig config = MilvusVectorStoreConfig.builder()
-			.withCollectionName(properties.getCollectionName())
-			.withDatabaseName(properties.getDatabaseName())
-			.withIndexType(IndexType.valueOf(properties.getIndexType().name()))
-			.withMetricType(MetricType.valueOf(properties.getMetricType().name()))
-			.withIndexParameters(properties.getIndexParameters())
-			.withEmbeddingDimension(properties.getEmbeddingDimension())
-			.withIDFieldName(properties.getIdFieldName())
-			.withAutoId(properties.isAutoId())
-			.withContentFieldName(properties.getContentFieldName())
-			.withMetadataFieldName(properties.getMetadataFieldName())
-			.withEmbeddingFieldName(properties.getEmbeddingFieldName())
+		return MilvusVectorStore.builder(milvusClient)
+			.embeddingModel(embeddingModel)
+			.initializeSchema(properties.isInitializeSchema())
+			.batchingStrategy(batchingStrategy)
+			.observationRegistry(observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP))
+			.customObservationConvention(customObservationConvention.getIfAvailable(() -> null))
 			.build();
-
-		return new MilvusVectorStore(milvusClient, embeddingModel, config, properties.isInitializeSchema(),
-				batchingStrategy, observationRegistry.getIfUnique(() -> ObservationRegistry.NOOP),
-				customObservationConvention.getIfAvailable(() -> null));
 	}
 
 	@Bean

spring-ai-spring-boot-autoconfigure/src/main/java/org/springframework/ai/autoconfigure/vectorstore/milvus/MilvusVectorStoreProperties.java

@@ -17,7 +17,7 @@
 package org.springframework.ai.autoconfigure.vectorstore.milvus;
 
 import org.springframework.ai.autoconfigure.vectorstore.CommonVectorStoreProperties;
-import org.springframework.ai.vectorstore.MilvusVectorStore;
+import org.springframework.ai.milvus.vectorstore.MilvusVectorStore;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.util.Assert;
 

…ore/MilvusFilterExpressionConverter.java …ore/MilvusFilterExpressionConverter.javavector-stores/spring-ai-milvus-store/src/main/java/org/springframework/ai/vectorstore/MilvusFilterExpressionConverter.java renamed to vector-stores/spring-ai-milvus-store/src/main/java/org/springframework/ai/milvus/vectorstore/MilvusFilterExpressionConverter.java vector-stores/spring-ai-milvus-store/src/main/java/org/springframework/ai/vectorstore/MilvusFilterExpressionConverter.java renamed to vector-stores/spring-ai-milvus-store/src/main/java/org/springframework/ai/milvus/vectorstore/MilvusFilterExpressionConverter.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.ai.vectorstore;
+package org.springframework.ai.milvus.vectorstore;
 
 import org.springframework.ai.vectorstore.filter.Filter.Expression;
 import org.springframework.ai.vectorstore.filter.Filter.ExpressionType;