# ElasticSearch Search

*author: Jael*

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## Description

The search operator runs a search via ElasticSearch client given a query.
It takes a dictionary as input, which should be written in [Query DSL](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl.html).
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

With an example ElasticSearch client 'localhost:9200',
search across the index 'test_index' using an example query `{'match_all': {}}` to get all documents.

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


query = {'match_all': {}}
es_search = (
    pipe.input('index_name', 'query')
        .map(('index_name', 'query'), 'res', ops.elasticsearch.search_client(
            host='localhost', port=9200
        ))
        .output('query', 'res')
)

res = es_search('test_index', query)
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:**

Search results wrapped by `elastic_transport.ObjectApiResponse`.