Advanced Elasticsearch 7.0

Client initialization

By using the elasticsearch module to import the Elasticsearch class, we can initialize a low-level client with a hostname or address, a port, and parameters such as maximum connections, maxsize. The getInstance() method call returns the singleton client. With the following code block, you can obtain a low-level client running on the localhost with port=9200 and maxsize=25:

from elasticsearch import Elasticsearchclass ESLowLevelClient:    __es = None    __es_lock = threading.Lock()    @staticmethod    def get_instance():        if ESLowLevelClient.__es is None:            with ESLowLevelClient.__es_lock:            if ESLowLevelClient.__es is None:                ESLowLevelClient.__es = Elasticsearch(['localhost'],                                                       port=9200, maxsize=25)        return ESLowLevelClient.__es def  ...