ES mapping example to keep special chars

gistfile1.json

PUT test_index 
{
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0,
    "analysis": {
      "analyzer": {
        "test_analyzer": {
          "type":"custom",
          "tokenizer": "whitespace",
          "filter": ["lowercase", "test_filter"]
        }
      },
      "filter": {
        "test_filter": {
          "type": "word_delimiter",
          "type_table": [
            "# => ALPHANUM",
            "@ => ALPHANUM",
            "$ => ALPHANUM"
          ]
        }
      }
    }
  },
  "mappings": {
    "test_doc": {
      "properties": {
        "content": {
          "type": "string",
          "analyzer": "test_analyzer"
        }
      }
    }
  }
}

PUT test_index/test_doc/1
{
  "content": "I love #elasticsearch"
}


PUT test_index/test_doc/2
{
  "content": "Elasticsearch is awsome"
}


GET test_index/test_doc/_search
{
  "query": {
    "match": {
      "content": "#elasticsearch"
    }
  }
}