ELS: 

...

• All VLAN stuff under "ethernet-switching-options" moved under "vlans" 

• ethernet-switching-options  >>>  switch-options

Enhanced Layer 2 Software (ELS) is a standardized Layer 2 configuration syntax that
addresses customer requests for a common Layer 2 configuration for Junos OS

Enhanced Layer 2 Software (ELS) provides a uniform CLI for configuring and monitoring Layer 2 features on QFX Series switches, EX Series switches,
and other Juniper Networks devices, such as MX Series routers. With ELS, you configure Layer 2 features in the same way on all these Juniper Networks devices.

Getting Started with Enhanced Layer 2 Software

...