[chef] knife search node "role:*" returns wrong results

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Hello,

based on wrong results out of cookbook search I tried to use the knife search
on cmdline. Having 2 nodes with same run list containing at least one similar
role the "knife search node "role:*foo*" doesnt return both nodes. The results
differ from time to time - no result was also in the range.

Checking the nodes via knife node foobar1 edit - you will see the role
assigned.
So I assumed to rebuild the solr index via "knife index rebuild". 
Sometimes we  had been successful, sometimes not. Unfortunatly once it is
failing - never again we have a valuebale result.

Now I am lookiung for some hints to troubleshoot and to rebuild the solr index
from scratch (meaning empty index directory) - if possible.

thanks in advance
Thorsten