返回Solr 4.7突出显示的多值字段的所有相关值

Question

我正在使用Solr4.7在我的服务器上启用标准高亮显示。我的文件(除其他外)包括下列字段：

{
        "id": [
          "fdc3833a-0e4f-4314-ba8c"
        ],,
        "tag": [
          "solr",
          "solrJ",
          "solrCloud"
          "solrX"
        ],
        "title": "Solr question about highlighting",
        "description": "I am working to enable Standard Highlighting on my server with Solr 4.7. My documents contain (among the others) the following.........",
      }

在这三个字段中，只有“标记”是多值的。我在solrconfig.xml文件中的默认配置是：

<str name="hl">on</str>
<str name="hl.fl">content title description tag</str>
<str name="hl.snippets">2</str>

当我运行这样的查询时：

https://<YOUR_PATH>/select?q=solr*&wt=json&indent=true

我有以下要点：

"highlighting": {
    "fdc3833a-0e4f-4314-ba8c": {
          "title": [
            "<b>Solr</b> question about highlighting"
          ],
          "summary": [
            "I am working to enable Standard Highlighting on my server with <b>Solr</b> 4.7. My documents contain (among the others) the following........."
          ],
          **"tag": [
            "<b>Solr</b>",
            "<b>SolrJ</b>"
          ]**
        }
}

而我希望得到所有的标签。我发现Solr在多值字段中处理多个值，就像它们被高亮显示一样，因此由于我有hl.snippets=2，所以只显示前两个值。如何获得标记的所有值？(显然，仅为多值字段更改代码段的数量是不可接受的答案)。在Solr 4.7中是否有一种在突出显示中处理多值字段的方法？

我的期望是得到这样的回应：

"highlighting": {
"fdc3833a-0e4f-4314-ba8c": {
      "title": [
        "<b>Solr</b> question about highlighting"
      ],
      "summary": [
        "I am working to enable Standard Highlighting on my server with <b>Solr</b> 4.7. My documents contain (among the others) the following........."
      ],
      **"tag": [
        "<b>Solr</b>",
        "<b>SolrJ</b>",
        "<b>SolrCloud</b>",
        "<b>SolrX</b>"
      ]**
    }
}

Answer 1

在搜索文档并运行一些测试之后，我发现在solrconfig.xml中设置参数solrconfig.xml：

<str name="hl.preserveMulti">true</str>

它不仅像文档所说的那样保留multiValue文档中值的顺序，而且还按其原始顺序返回多值文档的所有值。因此，如果我们设置上述参数，并且索引中有以下文档：

{
        "id": [
          "fdc3833a-0e4f-4314-ba8c"
        ],,
        "tag": [
          "solr",
          "solrJ",
          "solrCloud"
          "solrX",
          "notRelevantTag"
        ],
        "title": "Solr question about highlighting",
        "description": "I am working to enable Standard Highlighting on my server with Solr 4.7. My documents contain (among the others) the following.........",
      }

查询：

https://<YOUR_PATH>/select?q=solr*&wt=json&indent=true

将给我一个突出的结果如下：

"highlighting": {
    "fdc3833a-0e4f-4314-ba8c": {
          "title": [
            "<b>Solr</b> question about highlighting"
          ],
          "summary": [
            "I am working to enable Standard Highlighting on my server with <b>Solr</b> 4.7. My documents contain (among the others) the following........."
          ],
          **"tag": [
            "<b>Solr</b>",
            "<b>SolrJ</b>",
            "<b>SolrCloud</b>",
            "<b>SolrX</b>",
            "notRelevantTag"
          ]**
        }
    }