Neo4j module: remove unnecessary property removal.

Closes spring-projects#1932

Signed-off-by: Gerrit Meier <[email protected]>

Author: meistermeier

vector-stores/spring-ai-neo4j-store/src/main/java/org/springframework/ai/vectorstore/neo4j/Neo4jVectorStore.java

@@ -207,12 +207,7 @@ public void doAdd(List<Document> documents) {
 			var statement = """
 						UNWIND $rows AS row
 						MERGE (u:%s {%2$s: row.id})
-						ON CREATE
 							SET u += row.properties
-						ON MATCH
-							SET u = {}
-							SET u.%2$s = row.id,
-								u += row.properties
 						WITH row, u
 						CALL db.create.setNodeVectorProperty(u, $embeddingProperty, row[$embeddingProperty])
 					""".formatted(this.label, this.idProperty);