Why is no org.joda.time.Months including in elasticsearch-jar?

Hi,
because org.joda.time is included in elasticsearch, I use these classes to
program against elasticsearch results etc.
Now I am trying to use

import org.elasticsearch.common.joda.time.Months;

(http://www.joda.org/joda-time/apidocs/index.html)

but there isn't this Class in jar file of elasticsearch.
Why?

And when I will use the original lib of joda, witch version is used in
elasticsearch?
So I can be sure, that e.g. all Formatters are used in elasticsearch too.

thx
Sven

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