[FLINK-AGENTS-524] Add Amazon OpenSearch and S3 Vectors vector store integrations

- OpenSearchVectorStore: supports Serverless (AOSS) and Service domains, IAM and basic auth, SigV4 signing, bulk indexing, collection management for long-term memory
- S3VectorsVectorStore: PutVectors/QueryVectors/GetVectors/DeleteVectors, batched puts (500/request limit)
- Retry via unified RetryExecutor with service-specific retryable predicates

Author: Avichay Marciano

dist/pom.xml

@@ -99,6 +99,16 @@ under the License.
             <artifactId>flink-agents-integrations-vector-stores-elasticsearch</artifactId>
             <version>${project.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-agents-integrations-vector-stores-opensearch</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-agents-integrations-vector-stores-s3vectors</artifactId>
+            <version>${project.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.apache.flink</groupId>
             <artifactId>flink-agents-integrations-mcp</artifactId>

integrations/vector-stores/opensearch/pom.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you 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
+  http://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.
+-->
+<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/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.apache.flink</groupId>
+        <artifactId>flink-agents-integrations-vector-stores</artifactId>
+        <version>0.3-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>flink-agents-integrations-vector-stores-opensearch</artifactId>
+    <name>Flink Agents : Integrations: Vector Stores: OpenSearch</name>
+    <packaging>jar</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.flink</groupId>
+            <artifactId>flink-agents-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>software.amazon.awssdk</groupId>
+            <artifactId>apache-client</artifactId>
+            <version>${aws.sdk.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>software.amazon.awssdk</groupId>
+            <artifactId>auth</artifactId>
+            <version>${aws.sdk.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <version>1.3.9</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+</project>