Add custom service via Ambari ERROR

[#1]

Hi all:

I got HDP3.0 installed with Ambari 2.7 on my test_cluster, and my old cluster has HDP2.6.1.0 running for several months.

I add a custom service 'ELASTICSEARCH' in my old cluster running very well , however when I copy config to /var/lib/ambari-server/resources/stacks/HDP/3.0/services/ELASTICSEARCH and restart ambari-server ,I cannot install ELASTICSEARCH with this ERROR:

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/hook.py", line 35, in <module>
    BeforeAnyHook().execute()
  File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 353, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/hook.py", line 29, in hook
    setup_users()
  File "/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/shared_initialization.py", line 50, in setup_users
    groups = params.user_to_groups_dict[user],
KeyError: u'elasticsearch'
Error: Error: Unable to run the custom hook script ['/usr/bin/python', '/var/lib/ambari-agent/cache/stack-hooks/before-ANY/scripts/hook.py', 'ANY', '/var/lib/ambari-agent/data/command-452.json', '/var/lib/ambari-agent/cache/stack-hooks/before-ANY', '/var/lib/ambari-agent/data/structured-out-452.json', 'INFO', '/var/lib/ambari-agent/tmp', 'PROTOCOL_TLSv1_2', '']

I thought it related to my user&group configuration ,but I have no templates and I have no idea how it works.

Any suggestions would be very thankful !!!