Clarify that CREATE OR REPLACE DB deletes indexes and constraints as well (neo4j#2154)

You may need to preserve the database structure (indexes and
constraints) when you move the database from test env to production. In
this case, it's important to know that the `CREATE OR REPLACE DB` cmd
removes not only data but also indexes and constraints. If you want to
keep them, you have to do it before executing the command.

Author: NataliaIvakina

modules/ROOT/pages/database-administration/standard-databases/create-databases.adoc

@@ -205,6 +205,21 @@ CREATE OR REPLACE DATABASE customers
 
 This is equivalent to running `DROP DATABASE customers IF EXISTS` followed by `CREATE DATABASE customers`.
 
+Keep in mind that using `CREATE OR REPLACE DATABASE` also removes indexes and constraints.
+To preserve them, run the following Cypher commands before the `CREATE OR REPLACE DATABASE` and save their outputs:
+
+[source, cypher]
+----
+SHOW CONSTRAINTS YIELD createStatement AS statement
+----
+
+[source, cypher]
+----
+SHOW INDEXES YIELD createStatement, owningConstraint
+WHERE owningConstraint IS NULL
+RETURN createStatement AS statement
+----
+
 The behavior of `IF NOT EXISTS` and `OR REPLACE` apply to both standard and composite databases (e.g. a composite database may replace a standard database or another composite database).
 
 [NOTE]