文档字段setBoost中的lucene错误

Question

如lucene迁移指南所述，要设置文档级别提升，我们应将所有字段提升值乘以提升值。 这是我的代码：

    StringField nameField = new StringField("name", name, Field.Store.YES) ;
    StringField linkField = new StringField("link", link, Field.Store.YES);
    Field descField;
    TextField reviewsField = new TextField("reviews", reviews_str, Field.Store.YES);
    TextField authorsField = new TextField("authors", authors_str, Field.Store.YES);        
    FloatField scoreField = new FloatField("score", origScore,Field.Store.YES);
    if (desc != null) {
        descField = new TextField("desc", desc, Field.Store.YES);
    } else {
        descField = new TextField("desc", "", Field.Store.YES);
    }


    doc.add(nameField);
    doc.add(linkField);
    doc.add(descField);
    doc.add(reviewsField);
    doc.add(authorsField);
    doc.add(scoreField);


    nameField.setBoost(score);
    linkField.setBoost(score);
    descField.setBoost(score);
    reviewsField.setBoost(score);
    authorsField.setBoost(score);
    scoreField.setBoost(score);

但是我在运行代码时遇到了这个异常：

Exception in thread "main" java.lang.IllegalArgumentException: You cannot set an index-time boost on an unindexed field, or one that omits norms

我搜索过谷歌。 但我没有答案。 你能帮我吗？

Answer 1

索引时间提升存储在字段的规范中，默认情况下，StringField和FloatField都忽略规范。 因此，您需要在设置增强之前将它们打开。

要打开规范，您需要定义自己的字段类型：

//Start with a copy of the standard field type
FieldType myStringType = new FieldType(StringField.TYPE_STORED);
myStringType.setOmitNorms(false);
//StringField doesn't do anything special except have a customized fieldtype, so just use Field.
Field nameField = new Field("name", name, myStringType);

FieldType myFloatType = new FieldType(FloatField.TYPE_STORED);
myFloatType.setOmitNorms(false);
//For FloatField, use the appropriate FloatField ctor, instead of Field (similar for other numerics)
Field scoreField = new FloatField("score", origScore, myFloatType);