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Ezekiel Elliott says the security guard he pushed in a Las Vegas altercation demanded $500,000 in an attempt to extort him ... this according to police docs obtained by TMZ Sports.

The Dallas Cowboys star's attorneys say they were emailed a complete list of demands from 19-year-old Kyle Johnson and his father, Kelly Johnson, after Zeke shoved Kyle at the Electric Daisy Carnival last May.

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Police docs show Kelly emailed Zeke's attorneys just days after the altercation with AT LEAST 14 things he wanted from the running back to stay quiet on the incident ... including $500,000 cash.

The list of demands featured a public apology from Elliott, a press conference with Elliott and Kyle, $25,000 for the junior college football team Kyle played for, and signed jerseys from Zeke, Amari Cooper and Dak Prescott.

The demands list also included -- among several other things -- tickets to Cowboys games (both home and road), Ohio State games and a meet and greet with Jerry Jones and his son.

Police docs show one of Elliott's attorneys responded to Kelly's email with a phone call ... and Kelly claims in that conversation the attorney told him "what [he] was doing was extortion."

According to the docs, Kelly said after that conversation he decided to take Kyle's story to the public ... allowing Kyle to do an interview with a Los Angeles TV station on May 28.

Kelly and Kyle eventually filed a criminal complaint against Elliott over the incident ... but according to the docs, prosecutors felt they could not move forward with charges against 24-year-old Elliott.

There's more ... in the docs, Kyle admits Elliott not only apologized to him after shoving him during the May incident, he gave him a hug and took a picture with him.

In an affidavit from Elliott in the docs, he echoes that story, saying, "I had no intention to push and/or harm or intimidate Kyle Johnson."

"After Kyle Johnson fell and I was finished speaking with the officers nearby, I immediately apologized to Kyle and he indicated to me that he was not hurt."

Elliott added, "We gave each other a hug and he asked me to take a picture with him, which I was happy to do as there was never any intention to harm or hurt Kyle."

We've reached out to Kelly regarding the docs, but so far, no word back yet.

As for Zeke's camp, when reached by phone Friday, they declined to comment on the matter.