diff --git a/changelog/unreleased/pr-20097.toml b/changelog/unreleased/pr-20097.toml
new file mode 100644
index 000000000000..02a42b0821ff
--- /dev/null
+++ b/changelog/unreleased/pr-20097.toml
@@ -0,0 +1,4 @@
+type = "a"
+message = "bumping the OpenSearch (client, server in DataNode) to 2.15"
+
+pulls = ["20097"]
diff --git a/data-node/pom.xml b/data-node/pom.xml
index 532a24ca08b9..df7c5d41e150 100644
--- a/data-node/pom.xml
+++ b/data-node/pom.xml
@@ -44,7 +44,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <opensearch.version>2.12.0</opensearch.version>
+        <opensearch.version>2.15.0</opensearch.version>
 
         <!--
            We don't need to sign anything in this module. This fixes a release build error related to setting
@@ -551,7 +551,7 @@
                                 https://artifacts.opensearch.org/releases/bundle/opensearch/${opensearch.version}/opensearch-${opensearch.version}-linux-x64.tar.gz
                             </url>
                             <sha512>
-                                02af3abe0488279d9ba29cde8f69924344fdcef0bd59b13cec53e80121972469168c7479f4ffea645224c4e17d552b99408d5a217bdfe4851c143bde34afca90
+                                a72f218b581903b1ddf1072498560bc5304516ed57feb39735f920985740366c2779ed9174251a13b9a9dabdfc184119c325bb387dadf96485dc7964ecf32d54
                             </sha512>
                             <outputFileName>opensearch-${opensearch.version}-linux-x64.tar.gz</outputFileName>
                             <outputDirectory>${project.build.directory}/opensearch</outputDirectory>
@@ -575,7 +575,7 @@
                                 https://artifacts.opensearch.org/releases/bundle/opensearch/${opensearch.version}/opensearch-${opensearch.version}-linux-arm64.tar.gz
                             </url>
                             <sha512>
-                                33838c1a6374338641288df7bd97c17bbab739cc1ae8137ea9fcd9a0e4c6f6bb9b5c3a677a2c181d73dc513526018b7eed1e0db4ed3c12f93586727afa22fce1
+                                866c348ac39b7b35e671917349269383c75e1f9d10768742067807569180d1914fd09c6ae7e71d5e74bd77c8c8165ea17c19290b71f887f074dfe8e68dff66bb
                             </sha512>
                             <outputFileName>opensearch-${opensearch.version}-linux-aarch64.tar.gz</outputFileName>
                             <outputDirectory>${project.build.directory}/opensearch</outputDirectory>
@@ -601,7 +601,7 @@
                             <outputFileName>repository-s3-${opensearch.version}.zip</outputFileName>
                             <outputDirectory>${project.build.directory}/opensearch-plugins</outputDirectory>
                             <sha512>
-                                a99a5e92a48a7c2c0039b89ca074295e5ec10e40c92cb2801bed6a486588188f600d3deb0f805f0833f67fe4fda6d2f6fd199a81c4475927eb20ad76c78312fd
+                                de44a181133a33a08703e8464b52aa2ac29d1d9918d9478c307b98909a571baaaf0c9dcb664349802c3dd85fa53275bd2228248fd129179631b9096d470eb8d5
                             </sha512>
                         </configuration>
                     </execution>
diff --git a/pom.xml b/pom.xml
index 0748a751503f..0ddcd873b2c8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -87,7 +87,7 @@
         <maven.compiler.useIncrementalCompilation>false</maven.compiler.useIncrementalCompilation>
 
         <!-- Dependencies -->
-        <opensearch.shaded.version>2.12.0-2</opensearch.shaded.version>
+        <opensearch.shaded.version>2.15.0-1</opensearch.shaded.version>
         <airline.version>3.0.0</airline.version>
         <amqp-client.version>5.21.0</amqp-client.version>
         <antlr.version>4.13.2</antlr.version>