The Lucenia high-level Python client (lucenia-dsl-py) is deprecated. We recommend switching to the Python client (lucenia-py), which includes the functionality of lucenia-dsl-py.
High-level Python client
DEPRECATED
The Lucenia high-level Python client (lucenia-dsl-py) provides wrapper classes for common Lucenia entities, like documents, so you can work with them as Python objects. Additionally, the high-level client simplifies writing queries and supplies convenient Python methods for common Lucenia operations. The high-level Python client supports creating and indexing documents, searching with and without filters, and updating documents using queries.
This getting started guide illustrates how to connect to Lucenia, index documents, and run queries.
Setup
To add the client to your project, install it using pip:
pip install lucenia-dsl
After installing the client, you can import it like any other module:
from luceniapy import Lucenia
from lucenia_dsl import Search
Connecting to Lucenia
To connect to the default Lucenia host, create a client object with SSL enabled if you are using the Security plugin. You can use the default credentials for testing purposes:
host = 'localhost'
port = 9200
auth = ('admin', 'admin') # For testing only. Don't store credentials in code.
ca_certs_path = '/full/path/to/root-ca.pem' # Provide a CA bundle if you use intermediate CAs with your root CA.
# Create the client with SSL/TLS enabled, but hostname verification disabled.
client = Lucenia(
hosts = [{'host': host, 'port': port}],
http_compress = True, # enables gzip compression for request bodies
http_auth = auth,
use_ssl = True,
verify_certs = True,
ssl_assert_hostname = False,
ssl_show_warn = False,
ca_certs = ca_certs_path
)
If you have your own client certificates, specify them in the client_cert_path and client_key_path parameters:
host = 'localhost'
port = 9200
auth = ('admin', 'admin') # For testing only. Don't store credentials in code.
ca_certs_path = '/full/path/to/root-ca.pem' # Provide a CA bundle if you use intermediate CAs with your root CA.
# Optional client certificates if you don't want to use HTTP basic authentication.
client_cert_path = '/full/path/to/client.pem'
client_key_path = '/full/path/to/client-key.pem'
# Create the client with SSL/TLS enabled, but hostname verification disabled.
client = Lucenia(
hosts = [{'host': host, 'port': port}],
http_compress = True, # enables gzip compression for request bodies
http_auth = auth,
client_cert = client_cert_path,
client_key = client_key_path,
use_ssl = True,
verify_certs = True,
ssl_assert_hostname = False,
ssl_show_warn = False,
ca_certs = ca_certs_path
)
If you are not using the Security plugin, create a client object with SSL disabled:
host = 'localhost'
port = 9200
# Create the client with SSL/TLS and hostname verification disabled.
client = Lucenia(
hosts = [{'host': host, 'port': port}],
http_compress = True, # enables gzip compression for request bodies
use_ssl = False,
verify_certs = False,
ssl_assert_hostname = False,
ssl_show_warn = False
)
Creating an index
To create an Lucenia index, use the client.indices.create() method. You can use the following code to construct a JSON object with custom settings:
index_name = 'my-dsl-index'
index_body = {
'settings': {
'index': {
'number_of_shards': 4
}
}
}
response = client.indices.create(index_name, body=index_body)
Indexing a document
You can create a class to represent the documents that you’ll index in Lucenia by extending the Document class:
class Movie(Document):
title = Text(fields={'raw': Keyword()})
director = Text()
year = Text()
class Index:
name = index_name
def save(self, ** kwargs):
return super(Movie, self).save(** kwargs)
To index a document, create an object of the new class and call its save() method:
# Set up the lucenia-py version of the document
Movie.init(using=client)
doc = Movie(meta={'id': 1}, title='Moneyball', director='Bennett Miller', year='2011')
response = doc.save(using=client)
Performing bulk operations
You can perform several operations at the same time by using the bulk() method of the client. The operations may be of the same type or of different types. Note that the operations must be separated by a \n and the entire string must be a single line:
movies = '{ "index" : { "_index" : "my-dsl-index", "_id" : "2" } } \n { "title" : "Interstellar", "director" : "Christopher Nolan", "year" : "2014"} \n { "create" : { "_index" : "my-dsl-index", "_id" : "3" } } \n { "title" : "Star Trek Beyond", "director" : "Justin Lin", "year" : "2015"} \n { "update" : {"_id" : "3", "_index" : "my-dsl-index" } } \n { "doc" : {"year" : "2016"} }'
client.bulk(movies)
Searching for documents
You can use the Search class to construct a query. The following code creates a Boolean query with a filter:
s = Search(using=client, index=index_name) \
.filter("term", year="2011") \
.query("match", title="Moneyball")
response = s.execute()
The preceding query is equivalent to the following query in Lucenia domain-specific language (DSL):
GET my-dsl-index/_search
{
"query": {
"bool": {
"must": {
"match": {
"title": "Moneyball"
}
},
"filter": {
"term" : {
"year": 2011
}
}
}
}
}
Deleting a document
You can delete a document using the client.delete() method:
response = client.delete(
index = 'my-dsl-index',
id = '1'
)
Deleting an index
You can delete an index using the client.indices.delete() method:
response = client.indices.delete(
index = 'my-dsl-index'
)
Sample program
The following sample program creates a client, adds an index with non-default settings, inserts a document, performs bulk operations, searches for the document, deletes the document, and then deletes the index:
from luceniapy import Lucenia
from lucenia_dsl import Search, Document, Text, Keyword
host = 'localhost'
port = 9200
auth = ('admin', 'admin') # For testing only. Don't store credentials in code.
ca_certs_path = 'root-ca.pem'
# Create the client with SSL/TLS enabled, but hostname verification disabled.
client = Lucenia(
hosts=[{'host': host, 'port': port}],
http_compress=True, # enables gzip compression for request bodies
# http_auth=auth,
use_ssl=False,
verify_certs=False,
ssl_assert_hostname=False,
ssl_show_warn=False,
# ca_certs=ca_certs_path
)
index_name = 'my-dsl-index'
index_body = {
'settings': {
'index': {
'number_of_shards': 4
}
}
}
response = client.indices.create(index_name, index_body)
print('\nCreating index:')
print(response)
# Create the structure of the document
class Movie(Document):
title = Text(fields={'raw': Keyword()})
director = Text()
year = Text()
class Index:
name = index_name
def save(self, ** kwargs):
return super(Movie, self).save(** kwargs)
# Set up the lucenia-py version of the document
Movie.init(using=client)
doc = Movie(meta={'id': 1}, title='Moneyball', director='Bennett Miller', year='2011')
response = doc.save(using=client)
print('\nAdding document:')
print(response)
# Perform bulk operations
movies = '{ "index" : { "_index" : "my-dsl-index", "_id" : "2" } } \n { "title" : "Interstellar", "director" : "Christopher Nolan", "year" : "2014"} \n { "create" : { "_index" : "my-dsl-index", "_id" : "3" } } \n { "title" : "Star Trek Beyond", "director" : "Justin Lin", "year" : "2015"} \n { "update" : {"_id" : "3", "_index" : "my-dsl-index" } } \n { "doc" : {"year" : "2016"} }'
client.bulk(movies)
# Search for the document.
s = Search(using=client, index=index_name) \
.filter('term', year='2011') \
.query('match', title='Moneyball')
response = s.execute()
print('\nSearch results:')
for hit in response:
print(hit.meta.score, hit.title)
# Delete the document.
print('\nDeleting document:')
print(response)
# Delete the index.
response = client.indices.delete(
index = index_name
)
print('\nDeleting index:')
print(response)