'What is build_hash" : "unknown" in elasticsearch cluster 7.10.2?

We have a build a elasticsearch cluster with version 7.10.2 After hitting the cluster URL we are getting below information. We are getting build_hash" : "unknown" , could you please explain it??

is that mean cluster not built successfully or any error??

{ "name" : "XXXXXXXXXXX", "cluster_name" : "XXXXXXXXXXXXXXX", "cluster_uuid" : "XXXXXXXXXXXXXXX", "version" : { "number" : "7.10.2", "build_flavor" : "oss", "build_type" : "tar", "build_hash" : "unknown", "build_date" : "2021-09-20T07:12:51.966483Z", "build_snapshot" : false, "lucene_version" : "8.7.0", "minimum_wire_compatibility_version" : "6.8.0", "minimum_index_compatibility_version" : "6.0.0-beta1" }, "tagline" : "You Know, for Search" }


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