Elasticsearch

1. Checking if ElasticSearch is working

Use the curl command to check if the ElasticSearch server is responding:

curl -X GET "<http://localhost:9200/>"

Or enter url in your browser

jsx http://use.your.ip:9200/

You should see a response in JSON format, similar to the one below:

json { "name" : "your-node-name", "cluster_name" : "elasticsearch", "cluster_uuid" : "cluster-uuid", "version" : { "number" : "7.x.x", "build_flavor" : "default", "build_type" : "deb", "build_hash" : "build-hash", "build_date" : "build-date", "build_snapshot" : false, "lucene_version" : "lucene-version", "minimum_wire_compatibility_version" : "minimum-wire-version", "minimum_index_compatibility_version" : "minimum-index-version" }, "tagline" : "You Know, for Search" }

2. Adding a document to ElasticSearch

Add a document to the new index test-index:

curl -X POST "<http://localhost:9200/test-index/_doc/1>" -H 'Content-Type: application/json' -d' { "title": "Test Document", "content": "This is a test document for ElasticSearch." }'

3. Retrieving the document

Check if the document has been added correctly:

curl -X GET "<http://localhost:9200/test-index/_doc/1>"

You should see a response similar to the one below:

json { "_index": "test-index", "_type": "_doc", "_id": "1", "_version": 1, "_seq_no": 0, "_primary_term": 1, "found": true, "_source": { "title": "Test Document", "content": "This is a test document for ElasticSearch." } }

4. Searching the index

Now search the test-index for documents containing the word "test":

curl -X GET "<http://localhost:9200/test-index/_search>" -H 'Content-Type: application/json' -d' { "query": { "match": { "content": "test" } } }'

You should see a response containing the document you just added:

json { "took": 30, "timed_out": false, "_shards": { "total": 1, "successful": 1, "skipped": 0, "failed": 0 }, "hits": { "total": { "value": 1, "relation": "eq" }, "max_score": 0.2876821, "hits": [ { "_index": "test-index", "_type": "_doc", "_id": "1", "_score": 0.2876821, "_source": { "title": "Test Document", "content": "This is a test document for ElasticSearch." } } ] } }

5. Security

You may want to configure your firewall, such as ufw (Uncomplicated Firewall), to allow access only from your server's IP address. This means that only your server can access the necessary resources, and all other IP addresses will be blocked.