当我尝试索引具有text_general字段的文档时，出现以下错误：

Exception writing document id 93cf6aeb-54b0-471a-9325-5b8e95801131 to the index; possible analysis error: cannot change field "content" from index options=DOCS to inconsistent index options=DOCS_AND_FREQS_AND_POSITIONS

我尝试索引的文档如下所示：

{
    "filename": "FooBar.pdf",
    "content": "my test"
}

此字段的架构定义为：

<field name="content" type="text_general" uninvertible="true" indexed="true" required="true" stored="true"/>

其中字段类型定义为：

<fieldType name="text_general" class="solr.TextField" positionIncrementGap="100" multiValued="true">
    <analyzer type="index">
      <tokenizer class="solr.StandardTokenizerFactory"/>
      <filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/>
      <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>
    <analyzer type="query">
      <tokenizer class="solr.StandardTokenizerFactory"/>
      <filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/>
      <filter class="solr.SynonymGraphFilterFactory" expand="true" ignoreCase="true" synonyms="synonyms.txt"/>
      <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>
</fieldType>

如何成功地为具有text_general字段的文档编制索引？