What is meant by source data ? are you asking sample pdf file ? its confident i cant provide in public , as i told i gave contains query for full text index table, you can use any ocr'd pdf for testing. This is the query for filter in full text indexed table.
SELECT * FROM FileStore WHERE CONTAINS(Document,'invoice')
Excepted result as count result.
E,g : if one of file got 'invoice' word appear 10 times in that pdf, so result i want 10.
You know count function in sql what it return ? if u use this query u get row count as result
Select count(*) from tablename
Same like i need to count no of occurrences 'invoice' word form the table which in varbinary(max) datatype