Issue has been create - Ingestion of more than 10MB single file ingestion fails · Issue #566 · dadoonet/fscrawler · GitHub
In order to simulate this test at your end, just create dummy file. I created the same using windows batch command which is below:
echo "This is just a sample line appended to create a big file.. " > dummy.txt
for /L %i in (1,1,14) do type dummy.txt >> dummy.txt