There also was no sign of the officers filling out a UF250. Stop and Frisk activity is still occurring and in some cases it's only the paperwork that's decreased, which is a violation of police procedure. That alone should result in the disciplining of the two initial officers.
There are some gaps in the video during the beating, so we don't know exactly how the arrest played out. We need to see more of it to see the level of resistance. However, it seems unlikely that with 6 officers on the scene there was any legitimate justification for that level of force. This looks a lot like an unlawful stop followed by a beating for the non crime of "contempt of cop." The police know that what they are doing is unlawful and illegitimate, so they have to rely on false arrest and violence to get people to comply.