Elasticsearch provides single document APIs and multi-document APIs, where the API call is targeting a single document and multiple documents respectively.
Index API
It helps to add or update the JSON document in an index when a request is made to that respective index with specific mapping. For example, the following request will add the JSON object to index schools and under school mapping −
PUT schools/_doc/5
{
name":"City School", "description":"ICSE", "street":"West End",
"city":"Meerut",
"state":"UP", "zip":"250002", "location":[28.9926174, 77.692485],
"fees":3500,
"tags":["fully computerized"], "rating":"4.5"
}
On running the above code, we get the following result −
{
"_index" : "schools",
"_type" : "_doc",
"_id" : "5",
"_version" : 1,
"result" : "created",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 2,
"_primary_term" : 1
}
Automatic Index Creation
When a request is made to add JSON object to a particular index and if that index does not exist, then this API automatically creates that index and also the underlying mapping for that particular JSON object. This functionality can be disabled by changing the values of following parameters to false, which are present in elasticsearch.yml file.
action.auto_create_index:false
index.mapper.dynamic:false
You can also restrict the auto creation of index, where only index name with specific patterns are allowed by changing the value of the following parameter −
action.auto_create_index:+acc*,-bank*
Note − Here + indicates allowed and – indicates not allowed.
Versioning
Elasticsearch also provides version control facility. We can use a version query parameter to specify the version of a particular document.
PUT schools/_doc/5?version=7&version_type=external
{
"name":"Central School", "description":"CBSE Affiliation", "street":"Nagan",
"city":"paprola", "state":"HP", "zip":"176115", "location":[31.8955385, 76.8380405],
"fees":2200, "tags":["Senior Secondary", "beautiful campus"], "rating":"3.3"
}
On running the above code, we get the following result −
{
"_index" : "schools",
"_type" : "_doc",
"_id" : "5",
"_version" : 7,
"result" : "updated",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 3,
"_primary_term" : 1
}
Versioning is a real-time process and it is not affected by the real time search operations.
There are two most important types of versioning −
Internal Versioning
Internal versioning is the default version that starts with 1 and increments with each update, deletes included.
<h3 style="margin-t
