Thread:Project:Support desk/ElasticSearch extension not supported for CirrusSearch Extension downloaded from latest WIKI version 1.25.1/reply (3)

After I configured in the configuration variable $wgCirrusSearchServers = array( 'elasticsearch0', 'elasticsearch1' );

Will you please let me know what a ElasticSearch Server is? Is it the same server where I hosted MediaWIKI 1.25.1 with the extensions 'CirrusSearch-REL1_25-ace4f80.tar.gz' & 'Elastica-REL1_25-eb56a6d.tar.gz' ?

Still I get the below Err Notice after running script 'updateSearchIndexConfig.php'

content index...
 * 1) Fetching Elasticsearch version...unable to determine, aborting.PHP Notice:  Undefined index: version in /data/www/html/wikinew/extensions/CirrusSearch/includes/Maintenance/ConfigUtils.php on line 53
 * 2) Notice: Undefined index: version in /data/www/html/wikinew/extensions/CirrusSearch/includes/Maintenance/ConfigUtils.php on line 53
 * 3) ...Not supported!
 * 4) Only Elasticsearch 1.x is supported.  Your version:.

Please suggest.

Thank you !