ES Template config to preserve hashtag and mentions from tweets, so they can be queried.

hashtag_filter.json

"settings": {
    "analysis": {
        "filter": {
            "hashtag_filter": {
                "type": "word_delimiter",
                "type_table": [
                    "# => ALPHA",
                    "@ => ALPHA"
                 ]
             }
        },
        "analyzer": {
            "insensitive_whitespace": {
                "type": "custom",
                "filter": [
                    "lowercase",
                    "hashtag_filter"
                ]
                "tokenizer": "whitespace"
            }
        }
    }
}