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Use python script component.
Under meta information paste below script in script section.
Provide required credentials.
import pandas as pd
from pymongo import MongoClient
def myread():
    client = MongoClient("mongodb://localhost:27017/") #connection_string
    mydatabase = client.db_name#cdatabase_name
    mycollection = mydatabase.collection_name #collection_name
    cursor = mycollection.aggregate([ { '$project': { '_id': 0}}]) #aggregate_query
    df = pd.DataFrame(list(cursor))
    client.close()
    return df
myread()