Use Set.of() instead of new HashSet<>(Arrays.asList()) in MetadataConstraints.

[keith-turner]

Java recently introduced the Set.of() static methods for creating immutable sets. These new methods could be used here and here instead of new HashSet<>(Arrays.asList(. This would shorten the code and make the sets immutable, which seems to be the intention of the code.

[keith-turner]

There are other places where this type of change could be made. In Linux can run the following command on the Accumulo source code to look possible places to make this change.

find . -name "*.java" | xargs grep asList | grep new | grep Set 

However, not all of these places may be suitable for the replacement. In cases where the set is being mutated, would not want to use Set.of to create it.

[hguercan]

Hi, I would like to work on this issue

[EdColeman]

Closed with #2065