Hi I'm trying to do atomic updates with an 'add-distinct' modifier in a Solr 7 cloud. It seems to behave like an 'add' and I end up with double values in my multiValued field. This only happens with multiple values for the field in an update (cat:{"add-distinct":["a","b","d"]} exhibits this problem, cat:{"add-distinct":"a"} doesn't). When running the same update request with a single core, or a Solr 8 cloud, I get the expected result.
This is a minimal test case with Solr 7.7.3 in cloud mode, 2 nodes, a collection with shard count 1 and replicationFactor 2, using the techproducts configset. $ curl -X POST -H 'Content-Type: text/json' ' http://localhost:8983/solr/techproducts/update?commit=true' --data-binary '[{"id":123,cat:["a","b","c"]}]' { "responseHeader":{ "rf":2, "status":0, "QTime":75}} $ curl -X POST -H 'Content-Type: text/json' ' http://localhost:8983/solr/techproducts/update?commit=true' --data-binary '[{"id":123,cat:{"add-distinct":["a","b","d"]}}]' { "responseHeader":{ "rf":2, "status":0, "QTime":81}} $ curl ' http://localhost:8983/solr/techproducts/select?q=id%3A123&omitHeader=true' { "response":{"numFound":1,"start":0,"docs":[ { "id":"123", "cat":["a", "b", "c", "a", "b", "d"], "_version_":1668919799351083008}] }} Is this a known issue or am I missing something here? Kind regards Thomas Corthals