update log4j

pom.xml

@@ -12,7 +12,7 @@
     <inceptionYear>2011</inceptionYear>
 
     <properties>
-        <elasticsearch.version>7.14.0-SNAPSHOT</elasticsearch.version>
+        <elasticsearch.version>7.16.0</elasticsearch.version>
         <maven.compiler.target>1.8</maven.compiler.target>
         <elasticsearch.assembly.descriptor>${project.basedir}/src/main/assemblies/plugin.xml</elasticsearch.assembly.descriptor>
         <elasticsearch.plugin.name>analysis-ik</elasticsearch.plugin.name>
@@ -71,7 +71,7 @@
             <name>OSS Sonatype</name>
             <releases><enabled>true</enabled></releases>
             <snapshots><enabled>true</enabled></snapshots>
-            <url>http://oss.sonatype.org/content/repositories/releases/</url>
+            <url>https://oss.sonatype.org/content/repositories/releases/</url>
         </repository>
     </repositories>
 
@@ -93,7 +93,7 @@
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-api</artifactId>
-            <version>2.3</version>
+            <version>2.15.0</version>
         </dependency>
 
         <dependency>