docs: document new setting

Author: fbiville

modules/ROOT/pages/source/configuration.adoc

@@ -131,6 +131,9 @@ Requires both `neo4j.query.streaming-property` to be in the result set, and `$la
 | neo4j.query.streaming-property
 | Property name that is both present in the result set of the specified query and used as a filter to query changes from a previous value.
 
+| neo4j.query.force-maps-as-struct
+| In `COMPACT` mode, this forces the schema encoding of map values to be structs (default: `true`). Setting the value to `false` will only affect the schema encoding of maps with homogeneous value types. Note that the Protobuf converter does not support map message types.
+
 Default: `timestamp`
 
 | neo4j.query.poll-duration