Adding filter=0 to the request for Google will disable automatic filtering as explained here: https://support.google.com/gsa/answer/2672256?hl=en. By default, automatic filtering is enabled - not disabled, so it probably makes sense to have automatic filtering enabled, not disabled. Having it disabled means you may see one domain appear multiple times in the search results.
Adding
filter=0to the request for Google will disable automatic filtering as explained here: https://support.google.com/gsa/answer/2672256?hl=en. By default, automatic filtering is enabled - not disabled, so it probably makes sense to have automatic filtering enabled, not disabled. Having it disabled means you may see one domain appear multiple times in the search results.