12:49 PM PT -- The guy who saved Zeke's ass ... is the victim, according to cops.

A spokesperson for the Las Vegas Metro Police Dept. tells TMZ Sports ... the main reason Zeke wasn't arrested is because the victim didn't want to push forward with charges.

"On Sunday, May 19, 2019 at approximately 3 a.m. LVMPD officers working at EDC observed from a distance an adult male, later identified as Elliott, push a security officer to the ground."

"Two officers approached and placed Elliott into handcuffs while they investigated the incident. The security guard who was the victim of the misdemeanor battery, refused to press charges and officers escorted Elliott a short distance away and he was released."

If you're a Cowboys fan, might wanna buy this dude a beer the next time you're in Vegas.

Ezekiel Elliott was handcuffed at the EDC music festival in Las Vegas over the weekend after he shoved a security guard to the ground and TMZ Sports has the video.

... but the NFL star's attorney says Zeke was NOT formally arrested (only detained) and claims the whole thing is much ado about nothing.

Here's the deal ... the Dallas Cowboys superstar running back had been spotted in the parking lot at the Electric Daisy Carnival around 3 AM on Saturday morning arguing with his girlfriend.

Zeke never puts his hands on the woman but he uses his body to block her from walking away several times during the argument.

A short time later, Zeke and the woman are seen speaking with event staffers -- when suddenly Elliott confronts one them and says, "You got something to say!?"

Zeke gets in the staffer's face and uses his body to shove the guy backward until the staffer hits a metal gate -- that's when Zeke uses his forearm to shove the guy to the ground.

Zeke immediately throws his hands up and says, "I didn't do anything!"

Event security -- along with Las Vegas Metro Police Dept. officers rush over and eventually put Zeke in handcuffs and escort him away from the scene.

We spoke with Zeke's attorney, Frank Salzano, who says Elliott was released shortly after our video ends and he was not formally arrested or charged with a crime.

Salzano says Elliott was just having a normal discussion with his girlfriend and blames event security for "overreacting."

"Security misconstrued and overreacted to the situation," Salzano tells TMZ Sports.

"He was cuffed as a precautionary measure. He was released with no charges. He left Vegas that night and went to his [youth football camp in Dallas] on Sunday."

Even without an official arrest, Elliott could face discipline from the NFL if they find his actions violated the league's personal conduct policy.

Remember, the league had investigated Zeke in 2017 over allegations he physically abused an ex-girlfriend -- and even though he wasn't arrested, the league believed there was enough evidence to warrant a 6-game suspension.

Zeke has always maintained he did not attack the accuser in that situation.