diff --git a/.gitignore b/.gitignore
index fd211728d..ab44e3c2f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,10 +28,11 @@
 .vscode
 .DS_Store
 /plugins/
+/modules/
 /tomcat.8080/
 dbflute_fess/output/doc/lastadoc-fess.html
 dbflute_fess/schema/project-lastadoc-fess.json
-src/main/resources/fess_indices/.fess_config.access_token/access_token.bulk
+src/main/resources/fess_indices/fess_config.access_token/access_token.bulk
 src/main/resources/ga_client_secrets.p12
 src/main/webapp/WEB-INF/project.properties
 /.apt_generated/
diff --git a/module.xml b/module.xml
new file mode 100644
index 000000000..e45f50e62
--- /dev/null
+++ b/module.xml
@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="module" basedir=".">
+	<property name="modules.dir" value="${basedir}/modules" />
+	<property name="target.dir" value="${basedir}/target/modules" />
+
+	<!-- Maven Repository -->
+	<property name="maven.snapshot.repo.url" value="https://maven.codelibs.org/" />
+	<property name="maven.release.repo.url" value="https://maven.codelibs.org/" />
+	<property name="opensearch.version" value="1.2.4" />
+
+	<target name="install.modules">
+		<mkdir dir="${target.dir}" />
+		<delete dir="${modules.dir}" />
+		<mkdir dir="${modules.dir}" />
+
+		<!-- analysis-common -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="analysis-common" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+		<!-- geo -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="geo" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+		<!-- lang-expression -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="lang-expression" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+		<!-- lang-painless -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="lang-painless" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+		<!-- mapper-extras -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="mapper-extras" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+		<!-- reindex -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="reindex" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+		<!-- transport-netty4 -->
+		<antcall target="install.module">
+			<param name="repo.url" value="${maven.release.repo.url}" />
+			<param name="module.groupId" value="org/codelibs/opensearch" />
+			<param name="module.name.prefix" value="" />
+			<param name="module.name" value="transport-netty4" />
+			<param name="module.version" value="${opensearch.version}" />
+			<param name="module.zip.version" value="${opensearch.version}" />
+		</antcall>
+
+		<antcall target="remove.jars" />
+	</target>
+
+	<target name="install.module">
+		<get dest="${target.dir}">
+			<url url="${repo.url}/${module.groupId}/${module.name.prefix}${module.name}/${module.version}/${module.name.prefix}${module.name}-${module.zip.version}.zip" />
+		</get>
+		<unzip dest="${modules.dir}/${module.name}" src="${target.dir}/${module.name.prefix}${module.name}-${module.zip.version}.zip">
+			<patternset>
+				<include name="**" />
+			</patternset>
+			<cutdirsmapper dirs="1" />
+		</unzip>
+	</target>
+
+	<target name="remove.jars" if="with.fess">
+		<delete>
+			<fileset dir="${modules.dir}">
+				<include name="lang-expression/asm-*" />
+				<include name="lang-painless/asm-*" />
+				<include name="reindex/commons-codec-*" />
+				<include name="reindex/commons-logging-*" />
+				<include name="reindex/httpclient-*" />
+				<include name="reindex/httpcore-4*" />
+			</fileset>
+		</delete>
+	</target>
+</project>
diff --git a/plugin.xml b/plugin.xml
index ed44955b9..5c35eccae 100644
--- a/plugin.xml
+++ b/plugin.xml
@@ -6,8 +6,6 @@
 	<!-- Maven Repository -->
 	<property name="maven.snapshot.repo.url" value="https://oss.sonatype.org/content/repositories/snapshots" />
 	<property name="maven.release.repo.url" value="https://oss.sonatype.org/content/repositories/releases" />
-	<property name="use.opensearch" value="" />
-	<property name="name.prefix" value="elasticsearch" />
 
 	<target name="install.plugins">
 		<mkdir dir="${target.dir}" />
@@ -16,8 +14,8 @@
 		<!-- analysis-extension -->
 		<antcall target="install.plugin">
 			<param name="repo.url" value="${maven.release.repo.url}" />
-			<param name="plugin.groupId" value="org/codelibs${use.opensearch}" />
-			<param name="plugin.name.prefix" value="${name.prefix}-" />
+			<param name="plugin.groupId" value="org/codelibs/opensearch" />
+			<param name="plugin.name.prefix" value="opensearch-" />
 			<param name="plugin.name" value="analysis-extension" />
 			<param name="plugin.version" value="1.2.0" />
 			<param name="plugin.zip.version" value="1.2.0" />
@@ -25,8 +23,8 @@
 		<!-- analysis-fess -->
 		<antcall target="install.plugin">
 			<param name="repo.url" value="${maven.release.repo.url}" />
-			<param name="plugin.groupId" value="org/codelibs${use.opensearch}" />
-			<param name="plugin.name.prefix" value="${name.prefix}-" />
+			<param name="plugin.groupId" value="org/codelibs/opensearch" />
+			<param name="plugin.name.prefix" value="opensearch-" />
 			<param name="plugin.name" value="analysis-fess" />
 			<param name="plugin.version" value="1.2.0" />
 			<param name="plugin.zip.version" value="1.2.0" />
@@ -34,8 +32,8 @@
 		<!-- configsync -->
 		<antcall target="install.plugin">
 			<param name="repo.url" value="${maven.release.repo.url}" />
-			<param name="plugin.groupId" value="org/codelibs${use.opensearch}" />
-			<param name="plugin.name.prefix" value="${name.prefix}-" />
+			<param name="plugin.groupId" value="org/codelibs/opensearch" />
+			<param name="plugin.name.prefix" value="opensearch-" />
 			<param name="plugin.name" value="configsync" />
 			<param name="plugin.version" value="1.2.1" />
 			<param name="plugin.zip.version" value="1.2.1" />
@@ -43,8 +41,8 @@
 		<!-- minhash -->
 		<antcall target="install.plugin">
 			<param name="repo.url" value="${maven.release.repo.url}" />
-			<param name="plugin.groupId" value="org/codelibs${use.opensearch}" />
-			<param name="plugin.name.prefix" value="${name.prefix}-" />
+			<param name="plugin.groupId" value="org/codelibs/opensearch" />
+			<param name="plugin.name.prefix" value="opensearch-" />
 			<param name="plugin.name" value="minhash" />
 			<param name="plugin.version" value="1.2.0" />
 			<param name="plugin.zip.version" value="1.2.0" />
diff --git a/pom.xml b/pom.xml
index aeb6da901..a05181324 100644
--- a/pom.xml
+++ b/pom.xml
@@ -213,10 +213,12 @@
 				<configuration>
 					<target>
 						<ant antfile="${basedir}/dbflute.xml" target="download.dbflute" />
+						<ant antfile="${basedir}/module.xml" target="install.modules">
+							<property name="with.fess" value="true" />
+							<property name="opensearch.version" value="${opensearch.version}" />
+						</ant>
 						<ant antfile="${basedir}/plugin.xml" target="install.plugins">
 							<property name="with.fess" value="true" />
-							<property name="use.opensearch" value="/opensearch" />
-							<property name="name.prefix" value="opensearch" />
 						</ant>
 						<ant antfile="deps.xml" target="install.jars" />
 						<echo message="fess.version=${project.version}" file="${basedir}/src/main/webapp/WEB-INF/project.properties" />
@@ -501,6 +503,17 @@
 								<group>elasticsearch</group>
 							</mapper>
 						</data>
+						<!-- Add elasicsearch modules directory -->
+						<data>
+							<type>directory</type>
+							<src>${project.basedir}/modules</src>
+							<mapper>
+								<type>perm</type>
+								<prefix>${packaging.fess.home.dir}/es/modules</prefix>
+								<user>${packaging.fess.user}</user>
+								<group>${packaging.fess.group}</group>
+							</mapper>
+						</data>
 						<!-- Add elasicsearch plugins directory -->
 						<data>
 							<type>directory</type>
@@ -744,6 +757,15 @@
 							<username>elasticsearch</username>
 							<groupname>elasticsearch</groupname>
 						</mapping>
+						<!-- es/modules -->
+						<mapping>
+							<directory>${packaging.fess.home.dir}/es/modules</directory>
+							<sources>
+								<source>
+									<location>${project.basedir}/modules</location>
+								</source>
+							</sources>
+						</mapping>
 						<!-- es/plugins -->
 						<mapping>
 							<directory>${packaging.fess.home.dir}/es/plugins</directory>
@@ -1003,6 +1025,62 @@
 					<groupId>org.apache.httpcomponents</groupId>
 					<artifactId>httpcore</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>repository-url</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>percolator-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>reindex-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>mapper-extras-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>aggs-matrix-stats-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>rank-eval-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>lang-expression</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>ingest-common</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>ingest-user-agent</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>lang-mustache-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>lang-painless</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>parent-join-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>transport-netty4-client</artifactId>
+				</exclusion>
+				<exclusion>
+					<groupId>org.opensearch.plugin</groupId>
+					<artifactId>analysis-common</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 		<dependency>
diff --git a/src/main/java/org/codelibs/fess/es/client/SearchEngineClient.java b/src/main/java/org/codelibs/fess/es/client/SearchEngineClient.java
index 319fecd75..1c20191bc 100644
--- a/src/main/java/org/codelibs/fess/es/client/SearchEngineClient.java
+++ b/src/main/java/org/codelibs/fess/es/client/SearchEngineClient.java
@@ -260,6 +260,12 @@ public class SearchEngineClient implements Client {
                 }
                 config.disableESLogger();
                 runner.onBuild((number, settingsBuilder) -> {
+                    final File moduleDir = new File(esDir, "modules");
+                    if (moduleDir.isDirectory()) {
+                        settingsBuilder.put("path.modules", moduleDir.getAbsolutePath());
+                    } else {
+                        settingsBuilder.put("path.modules", new File(System.getProperty("user.dir"), "modules").getAbsolutePath());
+                    }
                     final File pluginDir = new File(esDir, "plugins");
                     if (pluginDir.isDirectory()) {
                         settingsBuilder.put("path.plugins", pluginDir.getAbsolutePath());