Index State Management support (#398)

* feat(plugins): add index management client plugin

Signed-off-by: florian <[email protected]>

* chore(CHANGELOG): added entry for ISM api support in changelog

Signed-off-by: florian <[email protected]>

* test(plugins): use assertEqual to compare call parameters

Signed-off-by: florian <[email protected]>

* test(plugins): edit policy to support older versions of opensearch

Signed-off-by: florian <[email protected]>

* test(plugins): ignore plugin tests when opensearch is unreleased

Signed-off-by: florian <[email protected]>

* test(plugins): move plugin tests into separate files

Signed-off-by: florian <[email protected]>

* test(plugins): fix import of OpenSearchTestCase

Signed-off-by: florian <[email protected]>

* chore(USER_GUIDE): add a index management plugin part

Signed-off-by: florian <[email protected]>

---------

Signed-off-by: florian <[email protected]>

opensearchpy/client/plugins.py

@@ -11,6 +11,7 @@
 import warnings
 
 from ..plugins.alerting import AlertingClient
+from ..plugins.index_management import IndexManagementClient
 from ..plugins.security import SecurityClient
 from .utils import NamespacedClient
 
@@ -24,7 +25,7 @@ class PluginsClient(NamespacedClient):
         self.alerting = AlertingClient(client)
         # self.anomaly_detection = AnomalyDetectionClient(client)
         # self.trace_analytics = TraceAnalyticsClient(client)
-        # self.index_management = IndexManagementClient(client)
+        self.index_management = IndexManagementClient(client)
         self.security = SecurityClient(client)
 
         self._dynamic_lookup(client)
@@ -39,7 +40,7 @@ class PluginsClient(NamespacedClient):
             "alerting",
             # "anomaly_detection",
             # "trace_analytics",
-            # "index_management",
+            "index_management",
             "security",
         ]
         for plugin in plugins: