[jira] [Created] (FLINK-9541) Add robots.txt and sitemap.xml to Flink website

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-9541:
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             Summary: Add robots.txt and sitemap.xml to Flink website
                 Key: FLINK-9541
                 URL: https://issues.apache.org/jira/browse/FLINK-9541
             Project: Flink
          Issue Type: Improvement
          Components: Project Website
            Reporter: Fabian Hueske


From the [dev mailing list|https://lists.apache.org/thread.html/71ce1bfbed1cf5f0069b27a46df1cd4dccbe8abefa75ac85601b088b@%3Cdev.flink.apache.org%3E]:

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It would help to add a sitemap (and the robots.txt required to reference it) for flink.apache.org and ci.apache.org (for /projects/flink)

You can see what Tomcat did along these lines - http://tomcat.apache.org/robots.txt references http://tomcat.apache.org/sitemap.xml, which is a sitemap index file pointing to http://tomcat.apache.org/sitemap-main.xml

By doing this, you can emphasize more recent versions of docs. There are other benefits, but reducing poor Google search results (to me) is the biggest win.

E.g.  https://www.google.com/search?q=flink+reducingstate <https://www.google.com/search?q=flink+reducingstate> (search on flink reducing state) shows the 1.3 Javadocs (hit #1), master (1.6-SNAPSHOT) Javadocs (hit #2), and then many pages of other results.

Whereas the Javadocs for 1.5 <https://ci.apache.org/projects/flink/flink-docs-release-1.5/api/java/org/apache/flink/api/common/state/ReducingState.html> and 1.4 <https://ci.apache.org/projects/flink/flink-docs-release-1.4/api/java/org/apache/flink/api/common/state/ReducingState.html> are nowhere to be found.
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