|
| 1 | += elasticsearch-py |
| 2 | + |
| 3 | +== Overview |
| 4 | + |
| 5 | +Official low-level client for Elasticsearch. Its goal is to provide common |
| 6 | +ground for all Elasticsearch-related code in Python; because of this it tries |
| 7 | +to be opinion-free and very extendable. The full documentation is available at |
| 8 | +https://elasticsearch-py.readthedocs.io |
| 9 | + |
| 10 | +=== Installation |
| 11 | + |
| 12 | +It can be installed with pip: |
| 13 | + |
| 14 | +[source,sh] |
| 15 | +------------------------------------- |
| 16 | +$ python -m pip install elasticsearch |
| 17 | +------------------------------------- |
| 18 | + |
| 19 | +If your application uses async/await in Python you can install with |
| 20 | +the `async` extra: |
| 21 | + |
| 22 | +[source,sh] |
| 23 | +-------------------------------------------- |
| 24 | +$ python -m pip install elasticsearch[async] |
| 25 | +-------------------------------------------- |
| 26 | + |
| 27 | +Read more about https://elasticsearch-py.readthedocs.io/en/master/async.html[how to use asyncio with this project]. |
| 28 | + |
| 29 | + |
| 30 | +=== Compatibility |
| 31 | + |
| 32 | +Current development happens in the master branch. |
| 33 | + |
| 34 | +The library is compatible with all Elasticsearch versions since `0.90.x` but you |
| 35 | +**have to use a matching major version**: |
| 36 | + |
| 37 | +For **Elasticsearch 7.0** and later, use the major version 7 (`7.x.y`) of the |
| 38 | +library. |
| 39 | + |
| 40 | +For **Elasticsearch 6.0** and later, use the major version 6 (``6.x.y`) of the |
| 41 | +library. |
| 42 | + |
| 43 | +For **Elasticsearch 5.0** and later, use the major version 5 (`5.x.y`) of the |
| 44 | +library. |
| 45 | + |
| 46 | +For **Elasticsearch 2.0** and later, use the major version 2 (`2.x.y`) of the |
| 47 | +library, and so on. |
| 48 | + |
| 49 | +The recommended way to set your requirements in your `setup.py` or |
| 50 | +`requirements.txt` is:: |
| 51 | + |
| 52 | + # Elasticsearch 7.x |
| 53 | + elasticsearch>=7,<8 |
| 54 | + |
| 55 | + # Elasticsearch 6.x |
| 56 | + elasticsearch>=6,<7 |
| 57 | + |
| 58 | + # Elasticsearch 5.x |
| 59 | + elasticsearch>=5,<6 |
| 60 | + |
| 61 | + # Elasticsearch 2.x |
| 62 | + elasticsearch>=2,<3 |
| 63 | + |
| 64 | +If you have a need to have multiple versions installed at the same time older |
| 65 | +versions are also released as ``elasticsearch2`` and ``elasticsearch5``. |
| 66 | + |
| 67 | +=== Example use |
| 68 | + |
| 69 | +Simple use-case: |
| 70 | + |
| 71 | +[source,python] |
| 72 | +------------------------------------ |
| 73 | +>>> from datetime import datetime |
| 74 | +>>> from elasticsearch import Elasticsearch |
| 75 | +
|
| 76 | +# By default we connect to localhost:9200 |
| 77 | +>>> es = Elasticsearch() |
| 78 | +
|
| 79 | +# Datetimes will be serialized... |
| 80 | +>>> es.index(index="my-index-000001", doc_type="test-type", id=42, body={"any": "data", "timestamp": datetime.now()}) |
| 81 | +{'_id': '42', '_index': 'my-index-000001', '_type': 'test-type', '_version': 1, 'ok': True} |
| 82 | +
|
| 83 | +# ...but not deserialized |
| 84 | +>>> es.get(index="my-index-000001", doc_type="test-type", id=42)['_source'] |
| 85 | +{'any': 'data', 'timestamp': '2013-05-12T19:45:31.804229'} |
| 86 | +------------------------------------ |
| 87 | + |
| 88 | +[NOTE] |
| 89 | +All the API calls map the raw REST API as closely as possible, including |
| 90 | +the distinction between required and optional arguments to the calls. This |
| 91 | +means that the code makes distinction between positional and keyword arguments; |
| 92 | +we, however, recommend that people use keyword arguments for all calls for |
| 93 | +consistency and safety. |
| 94 | + |
| 95 | +=== Features |
| 96 | + |
| 97 | +The client's features include: |
| 98 | + |
| 99 | +* Translating basic Python data types to and from JSON |
| 100 | + |
| 101 | +* Configurable automatic discovery of cluster nodes |
| 102 | + |
| 103 | +* Persistent connections |
| 104 | + |
| 105 | +* Load balancing (with pluggable selection strategy) across all available nodes |
| 106 | + |
| 107 | +* Failed connection penalization (time based - failed connections won't be |
| 108 | + retried until a timeout is reached) |
| 109 | + |
| 110 | +* Thread safety |
| 111 | + |
| 112 | +* Pluggable architecture |
| 113 | + |
| 114 | +The client also contains a convenient set of |
| 115 | +https://elasticsearch-py.readthedocs.org/en/master/helpers.html[helpers] for |
| 116 | +some of the more engaging tasks like bulk indexing and reindexing. |
| 117 | + |
| 118 | + |
| 119 | +=== Elasticsearch DSL |
| 120 | + |
| 121 | +For a more high level client library with more limited scope, have a look at |
| 122 | +https://elasticsearch-dsl.readthedocs.org/[elasticsearch-dsl] - a more Pythonic library |
| 123 | +sitting on top of `elasticsearch-py`. |
| 124 | + |
| 125 | +It provides a more convenient and idiomatic way to write and manipulate |
| 126 | +https://elasticsearch-dsl.readthedocs.org/en/latest/search_dsl.html[queries]. It |
| 127 | +stays close to the Elasticsearch JSON DSL, mirroring its terminology and |
| 128 | +structure while exposing the whole range of the DSL from Python either directly |
| 129 | +using defined classes or a queryset-like expressions. |
| 130 | + |
| 131 | +It also provides an optional |
| 132 | +https://elasticsearch-dsl.readthedocs.org/en/latest/persistence.html#doctype[persistence |
| 133 | +layer] for working with documents as Python objects in an ORM-like fashion: |
| 134 | +defining mappings, retrieving and saving documents, wrapping the document data |
| 135 | +in user-defined classes. |
| 136 | + |
| 137 | + |
| 138 | +=== License |
| 139 | + |
| 140 | +Licensed to Elasticsearch B.V. under one or more contributor |
| 141 | +license agreements. See the NOTICE file distributed with |
| 142 | +this work for additional information regarding copyright |
| 143 | +ownership. Elasticsearch B.V. licenses this file to you under |
| 144 | +the Apache License, Version 2.0 (the "License"); you may |
| 145 | +not use this file except in compliance with the License. |
| 146 | +You may obtain a copy of the License at |
| 147 | + |
| 148 | +http://www.apache.org/licenses/LICENSE-2.0 |
| 149 | + |
| 150 | +Unless required by applicable law or agreed to in writing, |
| 151 | +software distributed under the License is distributed on an |
| 152 | +"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 153 | +KIND, either express or implied. See the License for the |
| 154 | +specific language governing permissions and limitations |
| 155 | +under the License. |
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