class_docstr: This handler handles connection and execution of the Couchbase statements.
docstr: Close any existing connections
  Should switch self.is_connected.
docstr_tok: ["Close","any","existing","connections","Should","switch","self.is_connected","."]
code: def disconnect(self):
      """Close any existing connections
      Should switch self.is_connected.
      """
      if self.is_connected is False:
          return
      self.is_connected = self.cluster.connected
      return
  
imports: from datetime import timedelta
  from collections import OrderedDict
  from mindsdb.integrations.libs.base import DatabaseHandler
  from mindsdb.utilities import log
  from mindsdb_sql.parser.ast.base import ASTNode
  import pandas
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse, RESPONSE_TYPE
  from couchbase.auth import PasswordAuthenticator
  from couchbase.cluster import Cluster
  from couchbase.exceptions import UnAmbiguousTimeoutException
  from couchbase.options import ClusterOptions
  from couchbase.exceptions import KeyspaceNotFoundException, CouchbaseException
label_desc: Use image node_id 3 for calling the CouchbaseHandler obj's underlying member method code with example usage: obj.disconnect() without return types