Switch to Neo4j enterprise version, and switch to KEY for Neo4j key constraint.

dev/neo4j.yaml

@@ -1,7 +1,7 @@
 name: cocoindex-neo4j
 services:
   neo4j:
-    image: neo4j:latest
+    image: neo4j:5-enterprise
     volumes:
         - /$HOME/neo4j/logs:/logs
         - /$HOME/neo4j/config:/config
@@ -10,6 +10,15 @@ services:
     environment:
         - NEO4J_AUTH=neo4j/cocoindex
         - NEO4J_PLUGINS='["graph-data-science"]'
+        - NEO4J_ACCEPT_LICENSE_AGREEMENT=eval
+
+        # Uncomment to enable query logging
+        # - NEO4J_db_logs_query_enabled=VERBOSE
+        # - NEO4J_db_logs_query_transaction_enabled=VERBOSE
+        # - NEO4J_db_logs_query_parameter__logging__enabled=true
+        # - NEO4J_dbms_logs_http_enabled=true
+        # - NEO4J_server_logs_debug_enabled=true
+
     ports:
       - "7474:7474"
       - "7687:7687"

src/ops/storages/neo4j.rs

@@ -696,12 +696,14 @@ impl RelationshipSetupState {
                     )
                 })?;
                 for (label, node) in rel_spec.nodes.iter().flatten() {
-                    sub_components.push(ComponentState {
-                        object_label: ElementType::Node(label.clone()),
-                        index_def: IndexDef::KeyConstraint {
-                            field_names: key_field_names.clone(),
-                        },
-                    });
+                    if let Some(primary_key_fields) = &node.index_options.primary_key_fields {
+                        sub_components.push(ComponentState {
+                            object_label: ElementType::Node(label.clone()),
+                            index_def: IndexDef::KeyConstraint {
+                                field_names: primary_key_fields.clone(),
+                            },
+                        });
+                    }
                     for index_def in &node.index_options.vector_indexes {
                         sub_components.push(ComponentState {
                             object_label: ElementType::Node(label.clone()),
@@ -885,8 +887,12 @@ impl components::Operator for SetupComponentOperator {
         let matcher = state.object_label.matcher(qualifier);
         let query = neo4rs::query(&match &state.index_def {
             IndexDef::KeyConstraint { field_names } => {
+                let key_type = match &state.object_label {
+                    ElementType::Node(_) => "NODE",
+                    ElementType::Relationship(_) => "RELATIONSHIP",
+                };
                 format!(
-                    "CREATE CONSTRAINT {name} IF NOT EXISTS FOR {matcher} REQUIRE {field_names} IS UNIQUE",
+                    "CREATE CONSTRAINT {name} IF NOT EXISTS FOR {matcher} REQUIRE {field_names} IS {key_type} KEY",
                     name=key.name,
                     field_names=build_composite_field_names(qualifier, &field_names),
                 )