Elasticsearch Failed to find analyzer but it creates index without any error

Question

Here is my index settings json, when I test http://localhost:9200/myIndex/_analyze?text="testing the analyzer"&analyzer=nGram_analyzer I am getting the following exception.

{
  "error": {
    "root_cause": [
      {
        "type": "remote_transport_exception",
        "reason": "[Infectia][127.0.0.1:9300][indices:admin/analyze[s]]"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "failed to find analyzer [nGram_analyzer]"
  },
  "status": 400
}

index settings

  {
      "myIndex": {
        "mappings": {
          "practices": {
            "properties": {
              "practiceCity": {
                "type": "string",
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "practiceId": {
                "type": "long",
                "index":"not_analyzed"
              },
              "practiceName": {
                "type": "string",
                "boost": 10,
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "practicePhone": {
                "type": "long",
                "boost": 10,
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "practiceService": {
                "type": "string",
                "boost": 5,
                "index":"not_analyzed"
              }
            }
          },
          "users": {
            "_all": {
              "analyzer": "nGram_analyzer"
            },
            "properties": {
              "userCityId": {
                "type": "long",
                "index":"not_analyzed",
                "analyzer": "nGram_analyzer"
              },
              "userCityName": {
                "type": "string",
                "index":"not_analyzed"
              },
              "userEmail": {
                "type": "string",
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "userFirstName": {
                "type": "string",
                "boost": 10,
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "userId": {
                "type": "long"
              },
              "userLastName": {
                "type": "string",
                "boost": 10,
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "userMobile": {
                "type": "string",
                "index":"analyzed",
                "analyzer": "nGram_analyzer"
              },
              "userSpecialization": {
                "type": "string",
                "boost": 5,
                "index":"not_analyzed"
              }
            }
          }
        },
        "settings": {
          "index": {
            "analysis": {
            "analyzer": {
             "nGram_analyzer": {
                "type":      "custom",
                "tokenizer": "standard",
                  "filter": [
                    "nGram_filter"
                  ]
                }
              },
              "filter": {
                "nGram_filter": {
                  "max_gram": "20",
                  "type": "edgeNGram",
                  "min_gram": "3",
                  "token_chars": [
                    "letter",
                    "digit",
                    "punctuation",
                    "symbol"
                  ]
                }
              }
            },
            "number_of_replicas": "1",
            "number_of_shards": "5"
          }
        }
      }
    }

I am working on the auto complete functionality, is my index looks good? is there any suggestions for performance improvement?

Answer 1

You need to change the settings section like this: (i.e. analysis goes directly under settings not in index)

PUT myindex
{
  "mappings": {
    "practices": {
      "properties": {
        "practiceCity": {
          "type": "string",
          "index": "analyzed",
          "analyzer": "nGram_analyzer"
        },
        "practiceId": {
          "type": "long",
          "index": "not_analyzed"
        },
        "practiceName": {
          "type": "string",
          "boost": 10,
          "index": "analyzed",
          "analyzer": "nGram_analyzer"
        },
        "practicePhone": {
          "type": "long",
          "boost": 10
        },
        "practiceService": {
          "type": "string",
          "boost": 5,
          "index": "not_analyzed"
        }
      }
    },
    "users": {
      "properties": {
        "userCityId": {
          "type": "long"
        },
        "userCityName": {
          "type": "string",
          "index": "not_analyzed"
        },
        "userEmail": {
          "type": "string",
          "index": "analyzed",
          "analyzer": "nGram_analyzer"
        },
        "userFirstName": {
          "type": "string",
          "boost": 10,
          "index": "analyzed",
          "analyzer": "nGram_analyzer"
        },
        "userId": {
          "type": "long"
        },
        "userLastName": {
          "type": "string",
          "boost": 10,
          "index": "analyzed",
          "analyzer": "nGram_analyzer"
        },
        "userMobile": {
          "type": "string",
          "index": "analyzed",
          "analyzer": "nGram_analyzer"
        },
        "userSpecialization": {
          "type": "string",
          "boost": 5,
          "index": "not_analyzed"
        }
      }
    }
  },
  "settings": {
    "index": {
      "number_of_replicas": "1",
      "number_of_shards": "5"
    },
    "analysis": {
      "analyzer": {
        "nGram_analyzer": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "nGram_filter"
          ]
        }
      },
      "filter": {
        "nGram_filter": {
          "max_gram": "20",
          "type": "edgeNGram",
          "min_gram": "3",
          "token_chars": [
            "letter",
            "digit",
            "punctuation",
            "symbol"
          ]
        }
      }
    }
  }
}