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Google Cloud CLOUD NATURAL LANGUAGE API (entity_extraction) は、begin_offset に対して -1 を返します (nodejs と python の両方で)。パラメータが不足していますか

from google.cloud import language
from google.cloud.language import enums
from google.cloud.language import types

client = language.LanguageServiceClient()

text = u'Dr. James went to NYU yesterday'
document = types.Document(
    content=text,
    type=enums.Document.Type.PLAIN_TEXT)

results = client.analyze_entities(document=document).entities
print(results[0].mentions[0].text.begin_offset)
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