import com.ibm.icu.text.RawCollationKey; //导入依赖的package包/类
@Override
protected void parseCreateField(ParseContext context, List<IndexableField> fields) throws IOException {
    final String value;
    if (context.externalValueSet()) {
        value = context.externalValue().toString();
    } else {
        XContentParser parser = context.parser();
        if (parser.currentToken() == XContentParser.Token.VALUE_NULL) {
            value = fieldType().nullValueAsString();
        } else {
            value = parser.textOrNull();
        }
    }
    if (value == null) {
        return;
    }
    RawCollationKey key = collator.getRawCollationKey(value, null);
    final BytesRef binaryValue = new BytesRef(key.bytes, 0, key.size);
    if (fieldType().indexOptions() != IndexOptions.NONE || fieldType().stored()) {
        Field field = new Field(fieldType().name(), binaryValue, fieldType());
        fields.add(field);
    }
    if (fieldType().hasDocValues()) {
        fields.add(new SortedDocValuesField(fieldType().name(), binaryValue));
    }
}
 

import com.ibm.icu.text.RawCollationKey; //导入依赖的package包/类
@Override
protected BytesRef indexedValueForSearch(Object value) {
    if (value == null) {
        return null;
    }
    if (value instanceof BytesRef) {
        value = ((BytesRef) value).utf8ToString();
    }
    if (collator != null) {
        RawCollationKey key = collator.getRawCollationKey(value.toString(), null);
        return new BytesRef(key.bytes, 0, key.size);
    } else {
        throw new IllegalStateException("collator is null");
    }
}