以下代码：
from google.appengine.api import search
index = search.Index(name='members')
document = search.Document(
fields=[
search.TextField(name='full_name', value='sample text')
])
index.put(document)
results = index.search('full_name:tex')
logging.info(results)
返回：
search.SearchResults(number_found=0L)
我做错了什么？