# ElasticSearch Index

*author: Jael*

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## Description

The index operator index the given documents in ElasticSearch to get ready for retrieval.
It accepts a single document in dictionary or a list of documents (dictionaries) as input.
For each document, the index automatically generates a unique id.
To use this operator, you need to [set up ElasticSearch](https://www.elastic.co/guide/en/elasticsearch/reference/current/setup.html) in advance.

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## Code Example

Insert an example document into ElasticSearch with address of localhost:9200 and index of 'test_index'.

```python
from datetime import datetime
from towhee import pipe, ops, DataCollection


example_doc = {
    'title': 'Test Title',
    'author': 'Towhee',
    'content': 'This is an example.',
    'timestamp': datetime.now()
    }

es_insert = (
    pipe.input('index_name', 'doc')
        .map(('index_name', 'doc'), 'res', ops.elasticsearch.osschat_index(
            host='localhost', port=9200
        ))
        .output('doc', 'res')
)

res = es_insert('test_index', example_doc) # OR: es_insert('test_index', [example_doc])
DataCollection(res).show() # Optional: display output data
```

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## Factory Constructor

Create the operator via the following factory method:

***elasticsearch.search(host='localhost', port=9200, user=None, password=None, ca_certs=None)***

**Parameters:**

***host***: *str*

The host to connect ElasticSearch client.

***port***: *int*

The port to connect ElasticSearch client.

***user***: *str*

The username to connect ElasticSearch client if needed, defaults to None.

***password***: *str*

The user password to connect ElasticSearch client if needed, defaults to None.

***ca_certs***: *str*

The path to CA certificates to connect ElasticSearch client if needed, defaults to None.

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**Returns:**

Index response wrapped by `elastic_transport.ObjectApiResponse`.