Getting Started Webinar - Mappings Code

Mappings

#__________________________________________________
# Mappings
#__________________________________________________



#__________________________________________________
# All documents have a "mapping" (aka a schema).
# This is either defined up-front, or dynamically
# guessed by Elasticsearch

# Let's look at the mapping ES dynamically generated

GET /library/_mapping




#__________________________________________________
# We can add new fields...

PUT /library/books/_mapping
{
  "books": {
    "properties": {
      "my_new_field": {
        "type": "string"
      }
    }
  }
}

GET /library/_mapping


#__________________________________________________
# We can also specify custom settings (analyzers, etc)

PUT /library/books/_mapping
{
  "books": {
    "properties": {
      "english_field": {
        "type": "string",
        "analyzer": "english"
      }
    }
  }
}

GET /library/_mapping



#__________________________________________________
# But we cannot change an existing field!

PUT /library/books/_mapping
{
  "books": {
    "properties": {
      "english_field": {
        "type": "double"
      }
    }
  }
}


#__________________________________________________
# So does updating a mapping update the documents too?

GET library/books/_search

GET library/books/_search
{
  "query": {
    "match": {
      "english_field": "fox"
    }
  }
}


#__________________________________________________
# It often makes sense to map the fields you know
# to avoid problems, and leave the rest dynamic

POST /logs/transactions/
{
  "id": 234571
}

POST /logs/transactions/
{
  "id": 1391.223
}

GET /logs/transactions/_search
{
  "query": {
    "filtered": {
      "filter": {
        "range": {
          "id": {
            "gt": 1391,
            "lt": 1392
          }
        }
      }
    }
  }
}

GET /logs/_mapping

GET /logs/_search



#__________________________________________________
# We can also define custom analysis chains, for 
# more advanced usage.  Not enough time now, but
# see:

# More info: https://www.elastic.co/guide/en/elasticsearch/guide/current/analysis-intro.html