GH-26 - Add support for Neo4j vector index.

This commit brings support for Neo4j graph database in general,
and uses the vector index functionality available since version 5.11.

Aligned with the existing PgVector store and its tests.

The module creates indexes, if needed, for the vector search and
the identifier of the document object.

Add neo4j to vectordb docs page

Co-authored-by: Michael Simons <[email protected]>

Author: 2 people

pom.xml

@@ -21,6 +21,7 @@
 		<module>spring-ai-docs</module>
 		<module>vector-stores/spring-ai-pgvector-store</module>
 		<module>vector-stores/spring-ai-milvus-store</module>
+		<module>vector-stores/spring-ai-neo4j-store</module>
 	</modules>
 
     <organization>

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/vectordbs.adoc

@@ -53,8 +53,9 @@ The `VectorStore` implementations supported by Spring AI are:
 
 * InMemoryVectorStore
 * SimplePersistentVectorStore
-* PgVector - A Vector Store build on https://github.com/pgvector/pgvector[PostgreSQL/PGVector].
-* Milvus - A Vector Store build on https://milvus.io/[Milvus]
+* PgVector - The Vector Store https://github.com/pgvector/pgvector[PostgreSQL/PGVector].
+* Milvus - The Vector Store https://milvus.io/[Milvus]
+* Neo4j - The Vector Store https://neo4j.com/[Neo4j]
 
 More are implementations are coming, with Pinecone being the next implementation.
 

vector-stores/spring-ai-neo4j-store/pom.xml

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.experimental.ai</groupId>
+		<artifactId>spring-ai</artifactId>
+		<version>0.2.0-SNAPSHOT</version>
+		<relativePath>../../pom.xml</relativePath>
+	</parent>
+	<artifactId>spring-ai-neo4j-store</artifactId>
+	<packaging>jar</packaging>
+	<name>Spring AI Vector Store - neo4j</name>
+	<description>Spring AI Neo4j Vector Store</description>
+	<url>https://github.com/spring-projects-experimental/spring-ai</url>
+
+	<scm>
+		<url>https://github.com/spring-projects-experimental/spring-ai</url>
+		<connection>git://github.com/spring-projects-experimental/spring-ai.git</connection>
+		<developerConnection>[email protected]:spring-projects-experimental/spring-ai.git</developerConnection>
+	</scm>
+
+	<properties>
+		<spring-ai.version>0.2.0-SNAPSHOT</spring-ai.version>
+		<!-- testing -->
+		<testcontainers.version>1.19.0</testcontainers.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.experimental.ai</groupId>
+			<artifactId>spring-ai-core</artifactId>
+			<version>${spring-ai.version}</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.neo4j.driver</groupId>
+			<artifactId>neo4j-java-driver</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.neo4j</groupId>
+			<artifactId>neo4j-cypher-dsl-schema-name-support</artifactId>
+			<version>2023.7.0</version>
+		</dependency>
+
+		<!-- TESTING -->
+		<dependency>
+			<groupId>org.springframework.experimental.ai</groupId>
+			<artifactId>spring-ai-openai-spring-boot-starter</artifactId>
+			<version>${spring-ai.version}</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.testcontainers</groupId>
+			<artifactId>neo4j</artifactId>
+			<version>${testcontainers.version}</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.testcontainers</groupId>
+			<artifactId>junit-jupiter</artifactId>
+			<version>${testcontainers.version}</version>
+			<scope>test</scope>
+		</dependency>
+
+
+	</dependencies>
+
+</project>