javadoc lint issue

[beiwei30]

Javadoc lint issue leads to build failure on Java 8 and above with the command "mvn clean install -Papache-release".

This issue is exact same as #2864 reports. We still need to clean up all javadoc issues since we cannot fully control apache-release profile. Right now, we can work around this particular issue with the following change:

--- a/pom.xml
+++ b/pom.xml
@@ -196,6 +196,15 @@
     </dependencies>
 
     <profiles>
+        <profile>
+            <id>javadoc-lint</id>
+            <activation>
+                <jdk>[1.8,)</jdk>
+            </activation>
+            <properties>
+                <doclint>none</doclint>
+            </properties>
+        </profile>
         <profile>
             <id>checkstyle</id>
             <activation>