ElasticSearch重新索引的原因

Question

I'm migrating to elasticSearch and wanna find out some questions. I am gonna use static + dynamic mapping (static type for fields, which I will use for filtering during the search, will not change their types in the future). As I understand I can put different data to index and then change it. Example:

{
  "name": "John",
  "secondName": "Smith",
  "age": 20,
  "params" : [
    {
      "a": "b",
      "c": "d"
    },
    {
      "m": "n"
    }
  ]
}

and then change this record to:

{
  "name": "John",
  "secondName": "Smith",
  "age": "20",
  "newparams": [
    {
      "a": "b",
      "c": "d"
    },
    {
      "m": "n"
    }
  ]
}

So I can do it without reindexing. I can change fields, can add new so what are the reasons, which force me to do reindex?

Editing

The main goal is to use elastic instead of DB to enhance performance. There will be storage and I will only retrieve info from it. The search will depend on some fields with static mapping, I will no change their types. But in the future, I possible need to add some field or something like this, and I wanna know which my actions lead me to need to reindex?

Answer 1

Elasticsearch provides an reindex api which does this kind of things internally, take a look here . Alternative you can also update your documents with the update api.