Delete index cause the Master node offline

When I delete a big-data index,I saw my master node offline and recovery a while later.
I just feel the delete syntax is calling in the data node,have nothing to do with the master node.
Somebody help me to figure it out,thx!

What exact command are you sending?

DELETE /{index-name}

Ok. What are the master node logs?

What is the output of:

GET /
GET /_cat/nodes?v
GET /_cat/health?v
GET /_cat/indices?v

ok,I will reply the question again when I get the log in master is offline

Ok but then what are the current master logs?