The first operation to do before starting indexing data in ElasticSearch is to create an index: the main container of our data.
An index is similar to the concept of a database in SQL.
The HTTP method to create an index is PUT (but POST also works), the REST URL is the index name, which is written as follows:
http://<server>/<index_name>
For creating an index, we need to perform the following steps:
From command line, we can execute a
PUTcall as follows:curl -XPUT http://127.0.0.1:9200/myindex -d '{ "settings" : { "index" : { "number_of_shards" : 2, "number_of_replicas" : 1 } } }'
The result returned by ElasticSearch, if everything is all right, should be as follows:
{"ok":true,"acknowledged":true}If the index already exists, a 400 error is returned:
{"error":"IndexAlreadyExistsException[[myindex] Already exists]","status":400}