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设置索引mapping时报异常：[illegal field [index], only fields can be specified inside fields]

查询索引中的重复数据
POST /keywordindex/keywordV2,keywordoutter/_search
{
"size": 0,
"aggs": {
"duplicateCount": {
"terms": {
"field": "name.keyword",
"min_doc_count": 2,
"size": 10
},
"aggs": {
"duplicateDocuments": {
"top_hits": {
"size": 3
}
}
}
}
}
}