Nikita Pchelintsev created SOLR-10522:
-----------------------------------------

             Summary: Duplicate keys in "collations" object with JSON response 
format
                 Key: SOLR-10522
                 URL: https://issues.apache.org/jira/browse/SOLR-10522
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: spellchecker
    Affects Versions: 6.5
            Reporter: Nikita Pchelintsev
            Priority: Minor


After upgrading Solr 6.3 -> 6.5 I've noticed a change in how json response 
writer outputs "collations" response key when spellchecking is enabled 
(wt=json&json.nl=arrarr)

Solr 6.3:

"collations":
    [
      ["collation",{
          "collationQuery":"the",
          "hits":48,
          "maxScore":"30.282",
          "misspellingsAndCorrections":
          [
            ["thea","the"]]}],
      ["collation",{
          "collationQuery":"tea",
          "hits":3,
          "maxScore":"2.936",
          "misspellingsAndCorrections":
          [
            ["thea","tea"]]}],
      ...

Solr 6.5:

"collations":{
      "collation":{
        "collationQuery":"the",
        "hits":43,
        "misspellingsAndCorrections":
        [
          ["thea","the"]]},
      "collation":{
        "collationQuery":"tea",
        "hits":3,
        "misspellingsAndCorrections":
        [
          ["thea","tea"]]},
        ...

Solr 6.5 outputs object instead of an array, and it has duplicate keys which is 
not valid for JSON format.

Any help is appreciated.



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