Thread:Extension talk:CirrusSearch/how to delete indexes?

When I run updateSearchIndexConfig.php I get "Looks like the index has more than one identifier" error: How do I delete these indexes? I want to delete all and create one from scratch:

php maintenance/updateSearchIndexConfig.php content index... Fetching Elasticsearch version...1.0.0...ok       Scanning available plugins...none Infering index identifier...error Looks like the index has more than one identifier. You should delete all but the one of them currently active. Here is the list: XX_pre_content,XX_pre_content_1401790881,XX_pre_content_first,XX_pre_content_1401791290