elasticsearch-saml-metadata: add page (#17467)

Author: TheRootDaemon

pages/common/elasticsearch-saml-metadata.md

@@ -0,0 +1,16 @@
+# elasticsearch-saml-metadata
+
+> Generate SAML Service Provider metadata for configuring a SAML Identity Provider.
+> More information: <https://www.elastic.co/guide/en/elasticsearch/reference/current/saml-metadata.html>.
+
+- Generate SAML metadata for a specific realm and print it to `stdout`:
+
+`elasticsearch-saml-metadata --realm {{realm_name}}`
+
+- Generate SAML metadata and write it to a specific file:
+
+`elasticsearch-saml-metadata --realm {{realm_name}} --out {{path/to/file.xml}}`
+
+- Display help:
+
+`elasticsearch-saml-metadata {{[-h|--help]}}`