Changing the refresh interval on running nodes

I am seeing the refresh interval of 5 seconds instead of 1 second that I thought was the default. However, I want to change it to 1 second - I was wondering if there is a way to do it without bringing any of the nodes down. I have a cluster with 4 nodes and 1 index. Here is the status from 1 of the 4 nodes:

os: {
refresh_interval: 5000
cpu: {
vendor: "Intel"
model: "Xeon"
mhz: 2266
total_cores: 2
total_sockets: 2
cores_per_socket: 16
cache_size: "8kb"
cache_size_in_bytes: 8192
}
mem: {
total: "3.9gb"
total_in_bytes: 4194304000
}
swap: {
total: "1.9gb"
total_in_bytes: 2097434624
}
}

Thanks - I appreciate your help!

-cheers,
Manish