def logstash_install(self):
with cd('<STR_LIT>'):<EOL><INDENT>if not exists('<STR_LIT>'):<EOL><INDENT>sudo('<STR_LIT>'.format(<EOL>bigdata_conf.logstash_download_url<EOL>))<EOL><DEDENT>sudo('<STR_LIT>')<EOL>sudo('<STR_LIT>')<EOL><DEDENT>
logstash install
:return: