Add Docs: Elasticsearch Security Privileges

Add new page in documentation specifying the Elasticsearch Security Privileges required for ElastAlert

docs/source/elasticsearch_security_privileges.rst

@@ -0,0 +1,35 @@
+Elasticsearch Security Privileges
+*********************************
+
+While ElastAlert will just work out-of-the-box for unsecured Elasticsearch, it will need a user with a certain set of permissions to work on secure Elasticseach that allow it to read the documents, check the cluster status etc.
+
+SearchGuard Permissions
+=======================
+
+The permissions in Elasticsearch are specific to the plugin being used for RBAC. However, the permissions mentioned here can be mapped easily to different plugins other than Searchguard.
+
+Details about SearchGuard Action Groups: https://docs.search-guard.com/latest/action-groups
+
+
+Writeback Permissions
+---------------------------
+
+For the global config (which writes to the writeback index), you would need to give all permissions on the writeback indices.
+In addition, some permissions related to Cluster Monitor Access are required.
+
+``Cluster Permissions``: CLUSTER_MONITOR, indices:data/read/scroll*
+
+``Index Permissions`` (Over Writeback Indices): INDICES_ALL
+
+
+Per Rule Permissions
+--------------------------
+
+For per rule Elasticsearch config, you would need at least the read permissions on the index you want to query.
+Detailed SearchGuard Permissions:
+
+``Cluster Permissions``: CLUSTER_COMPOSITE_OPS_RO
+
+``Index Permissions`` (Over the index the rule is querying on): READ, indices:data/read/scroll*
+
+

docs/source/index.rst

@@ -15,6 +15,7 @@ Contents:
    running_elastalert
    ruletypes
    elastalert_status
+   elasticsearch_security_privileges
    recipes/adding_rules
    recipes/adding_alerts
    recipes/writing_filters