Close elastic APM client to release connections (#7517)

* Close elastic APM client to release connections

* Changelog fragment

changelogs/fragments/7517-elastic-close-client.yaml

@@ -0,0 +1,2 @@
+minor_changes:
+  - elastic callback plugin - close elastic client to not leak resources (https://github.com/ansible-collections/community.general/pull/7517).

plugins/callback/elastic.py

@@ -84,6 +84,7 @@ import time
 import uuid
 
 from collections import OrderedDict
+from contextlib import closing
 from os.path import basename
 
 from ansible.errors import AnsibleError, AnsibleRuntimeError
@@ -201,6 +202,7 @@ class ElasticSource(object):
 
         apm_cli = self.init_apm_client(apm_server_url, apm_service_name, apm_verify_server_cert, apm_secret_token, apm_api_key)
         if apm_cli:
+            with closing(apm_cli):
                 instrument()  # Only call this once, as early as possible.
                 if traceparent:
                     parent = trace_parent_from_string(traceparent)