Upgrade reference log4j package version (#4017)

admin/pom.xml

@@ -62,7 +62,7 @@
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-dependencies</artifactId>
-                <version>2.0.1.RELEASE</version>
+                <version>2.6.2</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>

client-adapter/es6x/pom.xml

@@ -27,22 +27,22 @@
         <dependency>
             <groupId>org.elasticsearch</groupId>
             <artifactId>elasticsearch</artifactId>
-            <version>6.4.3</version>
+            <version>6.8.22</version>
         </dependency>
         <dependency>
             <groupId>org.elasticsearch.client</groupId>
             <artifactId>transport</artifactId>
-            <version>6.4.3</version>
+            <version>6.8.22</version>
         </dependency>
         <dependency>
             <groupId>org.elasticsearch.client</groupId>
             <artifactId>elasticsearch-rest-client</artifactId>
-            <version>6.4.3</version>
+            <version>6.8.22</version>
         </dependency>
         <dependency>
             <groupId>org.elasticsearch.client</groupId>
             <artifactId>elasticsearch-rest-high-level-client</artifactId>
-            <version>6.4.3</version>
+            <version>6.8.22</version>
         </dependency>
 
         <dependency>

client-adapter/launcher/pom.xml

@@ -17,7 +17,7 @@
             <dependency>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-dependencies</artifactId>
-                <version>2.0.1.RELEASE</version>
+                <version>2.6.2</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>