Hello all , I am using solr 4.x , I have a requirement where I need to have a field which holds data from 2 fields concatenated using _. So for example I have 2 fields firstName and lastName , I want a third field which should hold firstName_lastName. Is there any existing concatenating component available or I need to write a custom updateProcessor which does this task. By the way need for having this third field is that I want to group on the firstname,lastName but as grouping does not support multiple fields to form single group I am using this trick. Hope I am clear .
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