[1]: max number of threads [2048] for user [elasticsearch] is too low, increase to at least [4096]

Hi,I install elasticsearch6.4 in ubuntu on docker, and I have set nproc to 4096, but I still get the error message "[1]: max number of threads [2048] for user [elasticsearch] is too low, increase to at least [4096]", Can someone help me, Thanks a lot.
The following is my configuration.

root@vc2crtp2160109n:/home/anumber/docker-elk# docker images
docker.elastic.co/kibana/kibana 6.4.0 a7e4cd1a7b45 13 days ago 666.9 MB
docker.elastic.co/elasticsearch/elasticsearch 6.4.0 1ac676545731 13 days ago 791.3 MB

root@vc2crtp2160109n:/home/anumber/docker-elk# cat /etc/security/limits.conf

elasticsearch soft memlock unlimited
elasticsearch hard memlock unlimited
elasticsearch - nofile 65536
elasticsearch - nproc 4096
root soft memlock unlimited
root hard memlock unlimited
root - nofile 65536
root - nproc 4096

root@vc2crtp2160109n:/home/anumber/docker-elk# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 63844
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 4096
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

root@vc2crtp2160109n:/home/a632680/docker-elk# grep nproc /etc/security/*
/etc/security/limits.conf:# - nproc - max number of processes
/etc/security/limits.conf:#@student hard nproc 20
/etc/security/limits.conf:#@faculty soft nproc 20
/etc/security/limits.conf:#@faculty hard nproc 50
/etc/security/limits.conf:#ftp hard nproc 0
/etc/security/limits.conf:elasticsearch - nproc 4096
/etc/security/limits.conf:root - nproc 4096

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