* and stop setting default values in python operator code, so defaults can be set at the server side.

This issue is just for the PR and questions from maintainers. 
airflow/providers/yandex/example_dags/example_yandexcloud_dataproc.py
#
#
from airflow import DAG
from airflow.providers.yandex.operators.yandexcloud_dataproc import (
    DataprocCreateClusterOperator,
    DataprocCreateHiveJobOperator,
    DataprocCreateMapReduceJobOperator,
    DataprocCreatePysparkJobOperator,
    DataprocCreateSparkJobOperator,
    DataprocDeleteClusterOperator,
)
from airflow.utils.dates import days_ago
CONNECTION_ID = 'yandexcloud_default'
AVAILABILITY_ZONE_ID = 'ru-central1-c'
S3_BUCKET_NAME_FOR_JOB_LOGS = ''
with DAG(
    'example_yandexcloud_dataproc_operator',
    schedule_interval=None,
    start_date=days_ago(1),
    tags=['example'],
) as dag:
    create_cluster = DataprocCreateClusterOperator(
        task_id='create_cluster',
        zone=AVAILABILITY_ZONE_ID,
        connection_id=CONNECTION_ID,
        s3_bucket=S3_BUCKET_NAME_FOR_JOB_LOGS,
    )
    create_hive_query = DataprocCreateHiveJobOperator(
        task_id='create_hive_query',