buildbot success in on flink-docs-release-1.6

[buildbot]

The Buildbot has detected a restored build on builder flink-docs-release-1.6 
while building . Full details are available at:
    https://ci.apache.org/builders/flink-docs-release-1.6/builds/211

Buildbot URL: https://ci.apache.org/

Buildslave for this Build: bb_slave2_ubuntu

Build Reason: The Nightly scheduler named 'flink-nightly-docs-release-1.6' 
triggered this build
Build Source Stamp: [branch release-1.6] HEAD
Blamelist: 

Build succeeded!

Sincerely,
 -The Buildbot