Azure Cognitive Search：DocumentExtractionSkill无法提取文件内容求助

项目中需要从多份文件提取内容写入Azure Cognitive Search的content字段，但执行索引器后，content和metadata字段均为空，无法完成文本提取。

数据库表结构 #

TABLE FileStorage (
    ID INT IDENTITY(1,1) PRIMARY KEY,
    FileName NVARCHAR(255) NOT NULL,     -- Name of the file
    FileData VARBINARY(MAX) NOT NULL,    -- Binary data of the file PDF
    UploadDate DATETIME DEFAULT GETDATE() -- Optional: Date of file upload
);

Azure Cognitive Search 索引配置 #

{
  "name": "files-index",
  "fields": [
    {
      "name": "ID",
      "type": "Edm.String",
      "key": true,
      "retrievable": true,
      "stored": true,
      "searchable": false,
      "filterable": true,
      "sortable": true,
      "facetable": true,
      "synonymMaps": []
    },
    {
      "name": "fileName",
      "type": "Edm.String",
      "key": false,
      "retrievable": true,
      "stored": true,
      "searchable": true,
      "filterable": true,
      "sortable": true,
      "facetable": true,
      "synonymMaps": []
    },
    {
      "name": "content",
      "type": "Edm.String",
      "key": false,
      "retrievable": true,
      "stored": true,
      "searchable": true,
      "filterable": true,
      "sortable": true,
      "facetable": true,
      "analyzer": "standard.lucene",
      "synonymMaps": []
    },
    {
      "name": "metadata",
      "type": "Edm.String",
      "key": false,
      "retrievable": true,
      "stored": true,
      "searchable": true,
      "filterable": true,
      "sortable": true,
      "facetable": true,
      "synonymMaps": []
    },
    {
      "name": "uploadDate",
      "type": "Edm.DateTimeOffset",
      "key": false,
      "retrievable": true,
      "stored": true,
      "searchable": false,
      "filterable": true,
      "sortable": true,
      "facetable": true,
      "synonymMaps": []
    }
  ],
  "scoringProfiles": [],
  "suggesters": [],
  "analyzers": [],
  "tokenizers": [],
  "tokenFilters": [],
  "charFilters": [],
  "normalizers": [],
  "similarity": {
    "@odata.type": "#Microsoft.Azure.Search.BM25Similarity"
  },
  "@odata.etag": ""
}

技能集配置 #

{
  "name": "testtwo",
  "description": "testtwo",
  "skills": [
    {
      "@odata.type": "#Microsoft.Skills.Util.DocumentExtractionSkill",
      "name": "#1",
      "description": "Extract text and metadata from binary documents (PDF, DOCX, etc.)",
      "context": "/document",
      "inputs": [
        {
          "name": "file_data",
          "source": "/document/file_data",
          "inputs": []
        }
      ],
      "outputs": [
        {
          "name": "text",
          "targetName": "content"
        },
        {
          "name": "metadata",
          "targetName": "metadata"
        }
      ],
      "parsingMode": "default",
      "dataToExtract": "contentAndMetadata",
      "_configuration": {}
    }
  ],
  "@odata.etag": ""
}

索引器配置 #

{
    "name": "filestorage-indexer",
    "dataSourceName": "filestorage-datasource",
    "targetIndexName": "files-index",
    "skillsetName": "testtwo",
    "fieldMappings": [
        {
            "sourceFieldName": "ID",
            "targetFieldName": "id"
        },
        {
            "sourceFieldName": "FileName",
            "targetFieldName": "fileName"
        }
    ],
    "outputFieldMappings": [
        {
            "sourceFieldName": "/document/content",
            "targetFieldName": "content"
        },
        {
            "sourceFieldName": "/document/metadata",
            "targetFieldName": "metadata"
        }
    ]
}

执行结果 #

索引器运行后，content、metadata及uploadDate字段均为空，示例返回结果：

{
  "@odata.context": "https://someurl.windows.net/indexes('files-index')/$metadata#docs(*)",
  "@odata.count": 29,
  "value": [
    {
      "@search.score": 1,
      "ID": "20",
      "fileName": "firstfile.pdf",
      "content": null,
      "metadata": null,
      "uploadDate": null
    },{
      "@search.score": 1,
      "ID": "3",
      "fileName": "blabla.pdf",
      "content": null,
      "metadata": null,
      "uploadDate": null
    }
  ]
}

请求帮助 #

已多次核对配置逻辑，但仍无法提取文件内容到对应字段，请求排查配置问题或提供替代方案。

内容的提问来源于stack exchange，提问作者kolek