How to do it...

1. Every field is automatically managed as an array. For example, to store tags for a document, the mapping will be as follows:

{
    "properties" : {
      "name" : {"type" : "keyword"},
      "tag" : {"type" : "keyword", "store" : "yes"},
      ...
      }
}

1. This mapping is valid for indexing both documents. The following is the code for document1:

{"name": "document1", "tag": "awesome"}

1. The following is the code for document2:

{"name": "document2", "tag": ["cool", "awesome", "amazing"] }