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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _crossmatch_transients_against_catalogues( self, transientsMetadataListIndex, colMaps):
 """run the transients through the crossmatch algorithm in the settings file **Key Arguments:** - ``transientsMetadataListIndex`` -- the list of transient metadata lifted from the database. - ``colMaps`` -- dictionary of dictionaries with the name of the database-view (e.g. `tcs_view_agn_milliquas_v4_5`) as the key and the column-name dictary map as value (`{view_name: {columnMap}}`). **Return:** - ``crossmatches`` -- a list of dictionaries of the associated sources crossmatched from the catalogues database .. todo :: - update key arguments values and definitions with defaults - update return values and definitions - update usage examples and text - update docstring text - check sublime snippet exists - clip any useful text to docs mindmap - regenerate the docs and check redendering of this docstring """


        global theseBatches

        self.log.debug(
            'starting the ``_crossmatch_transients_against_catalogues`` method')

        # SETUP ALL DATABASE CONNECTIONS

        transientsMetadataList = theseBatches[transientsMetadataListIndex]

        dbConn = database(
            log=self.log,
            dbSettings=self.settings["database settings"]["static catalogues"]
        ).connect()

        self.allClassifications = []

        cm = transient_catalogue_crossmatch(
            log=self.log,
            dbConn=dbConn,
            transients=transientsMetadataList,
            settings=self.settings,
            colMaps=colMaps
        )
        crossmatches = cm.match()

        self.log.debug(
            'completed the ``_crossmatch_transients_against_catalogues`` method')

        return crossmatches