improved configuration, added log file name, and simplified connection hosts setting
improved configuration, added log file name, and simplified connection hosts setting

murnieza/ElasticsearchBundle,saimaz/ElasticsearchBundle,trandangtri/ElasticsearchBundle,saimaz/ElasticsearchBundle,tautrimas/ElasticsearchBundle,murnieza/ElasticsearchBundle,asev/ElasticsearchBundle,martiis/ElasticsearchBundle,ndinh215/ONGRElasticsearchBundle,asev/ElasticsearchBundle,martiis/ElasticsearchBundle,ongr-io/ElasticsearchBundle,trandangtri/ElasticsearchBundle,ndinh215/ONGRElasticsearchBundle,tautrimas/ElasticsearchBundle