[FLINK-36595][docs] Explicitly set connector compatibility as string
diff --git a/docs/data/elastic.yml b/docs/data/elastic.yml
index 28a60df..9b90940 100644
--- a/docs/data/elastic.yml
+++ b/docs/data/elastic.yml
@@ -17,7 +17,7 @@
################################################################################
version: 3.1.0
-flink_compatibility: [1.18, 1.19, 1.20]
+flink_compatibility: ["1.18", "1.19", "1.20"]
variants:
- maven: flink-connector-elasticsearch6
sql_url: https://repo.maven.apache.org/maven2/org/apache/flink/flink-sql-connector-elasticsearch6/$full_version/flink-sql-connector-elasticsearch6-$full_version.jar
