Re: "java.lang.IllegalArgumentException: Could not load codec 'Lucene60'. Did you forget to add lucene-backward-codecs.jar?" Error

[Torsten Krah]

You would have to if you would e.g. still have had a Lucene50 Codec index
in use, even with 6.1.0.
This is not new that there is the backwards compatible jar which you need
to add if you want to use old codecs.

https://lucene.apache.org/core/6_2_0/backward-codecs/overview-summary.html