我在使用 Python elasticsearch_dsl 客户端访问 inner_hits 数据时遇到了问题。任何在 meta.inner_hits 中使用嵌入的 Response 对象的尝试都会在容器对象中的“_type”上产生 KeyError。以下代码是完全独立的,因此任何人都应该能够使用 Python 2.7 和 elasticsearch_dsl 5.0.0 重现相同的结果:
from elasticsearch import Elasticsearch
from elasticsearch_dsl import Index, Mapping, Nested, Search, Q
from elasticsearch_dsl.connections import connections
index = "test_index"
es_con = connections.create_connection(hosts=["localhost:9200"])
es_index = Index(index)
if es_index.exists():
es_index.delete()
es_index.create()
para_mapping = Mapping("paragraph")
para_mapping.field("sentences", Nested())
para_mapping.save(index)
test_paras = {}
for a in range(2):
test_paras[a] = {
"label": "Test Paragraph p{}".format(a),
"sentences": []
}
for b in range(2):
test_sent = {
"text": "Test Sentence p{}s{}".format(a, b),
}
test_paras[a]["sentences"].append(test_sent)
for idx, para in test_paras.iteritems():
para_id = "para_id_p{}".format(idx)
es_con.create(
index=index,
doc_type="paragraph",
id=para_id,
body=para
)
es_index.flush()
q_1 = Search(using=es_con).index(index).doc_type('paragraph')
q_2 = q_1 = q_1.query(
'nested', path='sentences', query=Q('term', **{"sentences.text": "p0s1"}), inner_hits={}
)
q_1 = q_1.execute()
# We got the expected paragraph
print "PARA_ID: ", q_1.hits[0].meta.id
# With all sentences
print "PARA[SENTENCES]: ", q_1.hits[0].sentences
# We can see inner_hits is included in para.meta
print "DIR PARA.META: ", dir(q_1.hits[0].meta)
# And it contains a "sentences" object
print "DIR PARA.META.INNER_HITS: ", dir(q_1.hits[0].meta.inner_hits)
# Of type elasticsearch_dsl.result.Response
print "TYPE PARA.META.INNER_HITS.SENTENCES:", type(q_1.hits[0].meta.inner_hits.sentences)
# That contains a "hits" object
print "DIR PARA.META.INNER_HITS.SENTENCES: ", dir(q_1.hits[0].meta.inner_hits.sentences)
# But every attempted action yields a KeyError: '_type' in result.AttrList()
try:
print q_1.hits[0].meta.inner_hits.sentences
except KeyError as e:
print "\nException:", type(e)
print "Message:", e
# Uncomment the following line to see full exception detail
# print dir(q.hits[0].meta.inner_hits.sentences.hits)
# The same query using the base-level API
es = Elasticsearch()
results = es.search(index=index, body=q_2.to_dict())
# This works just fine.
print "\nES RESULT:"
print results["hits"]["hits"][0]["inner_hits"]["sentences"]["hits"]["hits"][0]["_source"]["text"]
这是 API 中的错误吗?