Update MongoDB collection

import com.mongodb.MongoClient
import org.bson.Document as doc

def mongoClient = new MongoClient()
def database = mongoClient.getDatabase('school')
def collection = database.getCollection('students')

collection.find()
    .projection(['scores':1] as doc)
    .each {
        def minScore = it.scores.findAll { it.type == 'homework'}.min { it.score }
        it.scores.remove(minScore)
        collection.updateOne(['_id':it._id] as doc, ['$set':['scores':it.scores]] as doc)
    }