chore: update edge to avoid duplicated creation

Signed-off-by: Otavio Santana <[email protected]>

Author: otaviojava

jnosql-neo4j/src/main/java/org/eclipse/jnosql/databases/neo4j/communication/DefaultNeo4JDatabaseManager.java

@@ -235,8 +235,10 @@ public void edge(CommunicationEntity source, String label, CommunicationEntity t
         Objects.requireNonNull(label, "Relationship type is required");
 
         String cypher = "MATCH (s) WHERE elementId(s) = $sourceElementId " +
-                "MATCH (t) WHERE elementId(t) = $targetElementId " +
-                "CREATE (s)-[r:" + label + "]->(t)";
+                        "MATCH (t) WHERE elementId(t) = $targetElementId " +
+                        "WITH s, t " +
+                        "WHERE NOT EXISTS { MATCH (s)-[r:" + label + "]->(t) } " +
+                        "CREATE (s)-[r:" + label + "]->(t)";
 
         try (Transaction tx = session.beginTransaction()) {
             var sourceId = source.find(ID).orElseThrow(() ->