feat(neo4j): KEY constraint -> UNIQUE, to support community edition (#983)

Author: georgeh0

dev/neo4j.yaml

@@ -1,16 +1,15 @@
-name: cocoindex-neo4j
+name: cocoindex-neo4j-community
 services:
   neo4j:
-    image: neo4j:5-enterprise
+    image: neo4j:2025.08-community-ubi9
     volumes:
-        - /$HOME/neo4j/logs:/logs
-        - /$HOME/neo4j/config:/config
-        - /$HOME/neo4j/data:/data
-        - /$HOME/neo4j/plugins:/plugins
+        - /$HOME/neo4j/community/logs:/logs
+        - /$HOME/neo4j/community/config:/config
+        - /$HOME/neo4j/community/data:/data
+        - /$HOME/neo4j/community/plugins:/plugins
     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

docs/docs/ops/targets.md

@@ -442,15 +442,6 @@ docker compose -f <(curl -L https://raw.githubusercontent.com/cocoindex-io/cocoi
 This will bring up a Neo4j instance, which can be accessed by username `neo4j` and password `cocoindex`.
 You can access the Neo4j browser at [http://localhost:7474](http://localhost:7474).
 
-:::warning
-
-The docker compose config above will start a Neo4j Enterprise instance under the [Evaluation License](https://neo4j.com/terms/enterprise_us/),
-with 30 days trial period.
-Please read and agree the license before starting the instance.
-
-:::
-
-
 ### Kuzu
 
 #### Spec

examples/product_recommendation/.gitignore

@@ -0,0 +1 @@
+.env

src/ops/targets/neo4j.rs

@@ -739,12 +739,8 @@ impl components::SetupOperator 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 {key_type} KEY",
+                    "CREATE CONSTRAINT {name} IF NOT EXISTS FOR {matcher} REQUIRE {field_names} IS UNIQUE",
                     name = key.name,
                     field_names = build_composite_field_names(qualifier, field_names),
                 )