我用的是Datastax 6.8。这是我的SOLR模式：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<schema name="autoSolrSchema" version="1.5">
  <types>
    <fieldType class="org.apache.solr.schema.StrField" name="StrField"/>
    <fieldType class="org.apache.solr.schema.TextField" name="NameField">
      <analyzer type="index">
        <filter class="solr.ASCIIFoldingFilterFactory"/>
        <tokenizer class="solr.LowerCaseTokenizerFactory"/>
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt"/>
        <filter class="solr.NGramFilterFactory" maxGramSize="15" minGramSize="2"/>
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.LowerCaseTokenizerFactory"/>
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt"/>
        <filter class="solr.NGramFilterFactory" maxGramSize="15" minGramSize="2"/>
      </analyzer>
    </fieldType>
  </types>
  <fields>
    <field indexed="true" multiValued="false" name="nama" type="StrField"/>
    <field indexed="true" multiValued="false" name="nama_copy" type="NameField"/>
  </fields>
  <uniqueKey>(nama)</uniqueKey>
  <copyField dest="nama_copy" source="nama"/>
</schema>

I have this field value in a row我有这个字段值在一行
然后我运行了这个查询：

http://my_ip_address:8983/solr/search.form/select?wt=json&indent=true&fl=nama&q=nama_copy:batamindo\ v

我得到了很好的结果

{
  "responseHeader":{
    "status":0,
    "QTime":8},
  "response":{"numFound":579,"start":0,"docs":[
      {
        "nama":"BATAMINDO V "},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"},
      {
        "nama":"BATAMINDO V"}]
  }}

但当我跑的时候

http://my_ip_address:8983/solr/search.form/select?wt=json&indent=true&fl=nama&q=nama_copy:batamindo\ vi

我的搜索结果很差

{
  "responseHeader":{
    "status":0,
    "QTime":14},
  "response":{"numFound":602,"start":0,"docs":[
      {
        "nama":"MV. VINCA"},
      {
        "nama":"MV. VINASHIP PEARL"},
      {
        "nama":"MV. VINASHIP PEARL"},
      {
        "nama":"MV. VINCENT TRADER"},
      {
        "nama":"MV. MEGHNA VICTORY"},
      {
        "nama":"MV. MEGHNA VICTORY"},
      {
        "nama":"NAVI SUNNY"},
      {
        "nama":"MV. MEGHNA VICTORY"},
      {
        "nama":"MT. GOLDEN VIOLET"},
      {
        "nama":"MT. GOLDEN VIOLET"}]
  }}

这是怎么回事？