I have a field named "last-modified" that I like to use in bf (Boot Functions) parameter: recip(rord(last-modified),1,1000,1000) in DisMaxRequestHander. However the Solr query parser complain about the syntax of the formula. I think it is related with hyphen in the field name. I have tried to add single and double quote around the field name but didn't help. Can field name contain hyphen in boot functions? How to do it? If not, where do I find the field name special character restrictions? -Yao
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