what is meaning of management thread ？ and possible reasons
_nodes/hot_threads
85.2% (426ms out of 500ms) cpu usage by thread 'elasticsearch[node-2][management][T#5]'
6/10 snapshots sharing following 38 elements
java.io.UnixFileSystem.canonicalize0(Native Method)
java.io.UnixFileSystem.canonicalize(UnixFileSystem.java:172)
java.io.File.getCanonicalPath(File.java:618)
85.4% (427.2ms out of 500ms) cpu usage by thread 'elasticsearch[node-1][management][T#5]'
2/10 snapshots sharing following 31 elements
sun.nio.fs.UnixNativeDispatcher.stat0(Native Method)
sun.nio.fs.UnixNativeDispatcher.stat(UnixNativeDispatcher.java:286)