Elasticsearch cluster stats api return different values on different node

[l0calh0st]

on master _cluster/stats:
"fs" : {
"total_in_bytes" : 15874832596992,
"free_in_bytes" : 12578652061696,
"available_in_bytes" : 12578652061696,
"spins" : "true"
},

node analyzer1(hot) _cluster/stats:
"fs" : {
"total_in_bytes" : 16274067427328,
"free_in_bytes" : 12992671711232,
"available_in_bytes" : 12992671711232,
"spins" : "true"
},

on analyzer2(hot) _cluster/stats:
"fs" : {
"total_in_bytes" : 16274067427328,
"free_in_bytes" : 12989881016320,
"available_in_bytes" : 12989881016320,
"spins" : "true"
},

on analyzer3(warm) _cluster:

"fs" : {
"total_in_bytes" : 14753986846720,
"free_in_bytes" : 11355335659520,
"available_in_bytes" : 11355335659520,
"spins" : "true"
},

on analyzer4(warm) _cluster/stats

"fs" : {
"total_in_bytes" : 17874236866560,
"free_in_bytes" : 14598999666688,
"available_in_bytes" : 14598999666688,
"spins" : "true"
},

The five node are in same cluster,and the cluster status is green

Why am I getting different values of fs_total?

note: elastic version: 5.2.2 jdkversion: openjdk8

[Igor_Motov]

There is a _nodes section at the top of the each stats response. Could you check if you get the same numbers there and that failed field contains 0?

  "_nodes": {
    "total": NN,
    "successful": NN,
    "failed": 0
  },

[l0calh0st]

@Igor_Motov

section at the top of the each stats response. Could you che

when get same number s,i didn't care this value
but now get different numbers, i check it ,every failed field contains 0

[l0calh0st]

the interesting is the number changed, with no any regular(some increased, and some decreased)
the master values
last week:15874832596992 and now:15874832596992--------------------same

node1
last week:16274067427328 and now:16354156285952---------------------increased

node2
last week:16274067427328 and now:13875428327424 ------------------descreased

node3:
last week: 14753986846720 and now:17874236866560------------------increased

node4:
last week:17874236866560 and now:16274067427328 -------------descreased

[l0calh0st]

in my cluaster each node has 2 es instance
and each instance has 2 attribute : box_type and attr.zone

may be by affected this?

[l0calh0st]

the values changed