Try a hard reset of your iPad by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.
If your iPad is a 2014 iPad Air 2, that iPad is nearly 7-years old now.
It is entirely possible that the internal, rechargeable battery has failed/died and your iPad maybe dead.
I strongly suggest you search online to locate and call contact your nearest, âlocalâ Apple Store location to try/attempt to make an appointment to get your Apple iPad diagnosed and options presented to you.
OR, failing that,
Contact Apple support via the contact support link located at the upper right hand corner of every Webpage of these Apple support communities.
Use the Hardware Repair and Battery & Charging support categories.
OR
by installing and using the Apple Support app found in the iOS App Store.
Tap the iOS App Store link below.
https://apps.apple.com/us/app/apple-support/id1130498044
OR
Call contact Apple via the support numbers found in the link bekow.
Contact - How to Contact Us - Apple
Tap the link below.
https://www.apple.com/contact/
Best of Luck to You!
