let's say I want to have a search result whereby this particular field of each item has the string e.g # hashtag
like for example i have a data field named description, so what I want to get from the result, only those items that has a string 'hashtag' within their description like e.g
"the english alphabet has 28 letters #hashtag"
so, that item with this description field above should be included in the search result, because the description field value string has a "#hashtag" string inside.
how to do that in elastica ? what filtering or function should I use?