title: ElasticSearch Tokenizer keywords
body: <p>I'm wondering how elastic search tokenizes keywords.
  Example:
  So I'm using a search box for searching keywords in comments.
  When I search for "Zelle" only comments in Spanish showed up. 
  <a href="https://i.stack.imgur.com/LLQx8.png" rel="nofollow noreferrer">enter image description here</a>
  But if I search for "Zell", all comments with "Zelle" showed up, with highlighting "Zell".
  <a href="https://i.stack.imgur.com/8Pdui.png" rel="nofollow noreferrer">enter image description here</a>
  Can anyone please tell me why when I search for some keywords, only some comments in specific languages showed up?</p>
  
  <p>Edit1:
  The mapping is like this:</p>
  
  <pre><code> {
    "comments" : {
      "mappings" : {
        "ios" : {
          "properties" : {
            "content" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },
            "country" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },
            "date" : {
              "type" : "date"
            },
            "language" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },
            "product_id" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },
            "product_version" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },
            "rating" : {
              "type" : "long"
            },
            "title" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            },
            "user_language" : {
              "type" : "text",
              "fields" : {
                "keyword" : {
                  "type" : "keyword",
                  "ignore_above" : 256
                }
              }
            }
          }
        }
      }
    }
  }
  </code></pre>
  
  <p>and it did not have any info with the tokenizer.
  How should I know which tokenizer es uses for searching?</p>