elasticsearchHow can I get started with using Elasticsearch OSS?

1. First, download and install the Elasticsearch OSS from elastic.co.
2. Once installed, you can start up the Elasticsearch server by running ./bin/elasticsearch from the installation directory.
3. To verify that the server is running, you can use curl to make a request to the server, like this:

$ curl -XGET 'localhost:9200'
{
  "name" : "Ludwig",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "sEjEeVXFQKqC7xj3X5c2Ng",
  "version" : {
    "number" : "7.10.2",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "f27399d",
    "build_date" : "2021-01-12T17:10:04.951332Z",
    "build_snapshot" : false,
    "lucene_version" : "8.7.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

4. You can now use the Elasticsearch API to index documents, search, and perform other operations. For example, you can index a document like this:

$ curl -XPUT 'localhost:9200/blog/post/1' -H 'Content-Type: application/json' -d '
{
  "title" : "My first blog post",
  "body" : "This is my first blog post!"
}
'

{"_index":"blog","_type":"post","_id":"1","_version":1,"result":"created","_shards":{"total":2,"successful":1,"failed":0},"_seq_no":0,"_primary_term":1}

5. You can then search for documents using the Elasticsearch query DSL, like this:

$ curl -XGET 'localhost:9200/blog/post/_search?q=blog'
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.2876821,
    "hits" : [
      {
        "_index" : "blog",
        "_type" : "post",
        "_id" : "1",
        "_score" : 0.2876821,
        "_source" : {
          "title" : "My first blog post",
          "body" : "This is my first blog post!"
        }
      }
    ]
  }
}

6. To learn more about the Elasticsearch API and query DSL, you can refer to the Elasticsearch documentation.
7. You can also explore the Elasticsearch Tutorials to get started with more advanced features.

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