Dangled indices

[z_y_xing]

forgive my bad english!

i read this document about dangling indices
here was a part:
.....
any shards stored in its local data directory directory which do not already exist in the cluster ...

i thought closed index also have a meta info,but as follow fact confusing for me.

i get indices info via:

GET _cat/indices
...
      close malfunctionlog-20171121                       DtbhNG-uS8m8uoNKEL0pDA     
...

and my es log:

[2018-03-14T12:33:11,873][WARN ][o.e.c.m.MetaDataIndexUpgradeService] [master_183_97] [malfunctionlog-20171121/DtbhNG-uS8m8uoNKEL0pDA] ignoring unknown index setting: [index.store.throttle.max_bytes_per_sec] with value [30mb]; archiving
[2018-03-14T12:33:11,875][INFO ][o.e.g.LocalAllocateDangledIndices] [master_183_97] auto importing dangled indices [[malfunctionlog-20171121/DtbhNG-uS8m8uoNKEL0pDA]/CLOSE] from [{data_188_54}{YYokJS_-RACuV5LDY94H5Q}{bO723BNsTveimfmnWa1PVQ}{10.8.188.54}{10.8.188.54:9300}{ml.max_open_jobs=10, ml.enabled=true}]
[2018-03-14T12:33:15,385][WARN ][o.e.m.j.JvmGcMonitorService] [master_183_97] [gc][7384835] overhead, spent [527ms] collecting in the last [1s]