Retrieving specific fields in a Solr query?
Solution 1:
/?q=query&fl=field1,field2,field3
Solution 2:
From the Solr Admin home page, click on "Full Interface". On that page there is a box called "Fields to Return". You can list the you want here (comma-separated). "*" means all fields.
Solution 3:
http://xx.xxx.xx.xx:8983/solr/corename/select?indent=on&q=*:*&wt=json&fl=ImageID,Imagepath,Category
This link has fl parameter: fl is a field list, which will display the specified fields from the indexed list.