[chef] Error during knife search

[Chris < >]

Hi Chefs

I updated my chef-solr instance this morning from 0.10.8 to 10.18.2
using the debian package and an interesting error is popping up on
searches that return a large list of nodes

ERROR: ArgumentError: Attribute to_ary is not defined!

This wasn't happening prior to the update, i'm wondering if this is a
bug in 10.18?

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