A simple text file, each line representing a document that is going to be added to solr. The format is:
fieldName:fieldValue;
All required fields must be on the file.
id:1;name:dog;category:animal
id:2;name:cat;category:animal
id:3;name:lettuce;category:vegetable
if you want to escape a semicolon, use a slash and then a semicolon ";". If you want to add a slash, add two slashes "\".
Also, you can check de example file from the sorce code, this example works just fine with the solr example.