Elasticsearch installation and use

Elasticsearch is an open source real-time distributed search and analysis engine that can be used to quickly search, analyze, and store large amounts of data. The following is an introduction to the installation and use of Elasticsearch, including the installation process of the database and how to create data tables, insert, modify, query, and delete data: 1. Install Elasticsearch: -Firstly, you need to download the Elasticsearch installation package first. You can find the installation package suitable for your operating system on the download page of Elasticsearch official website. -After downloading, unzip the installation package to the path you want to install. -Enter the extracted directory, locate the bin folder, and run Elasticsearch. bat (Windows) or Elasticsearch (Linux/Mac) to start Elasticsearch. 2. Create a data table (index): -Open a terminal or command line window and initiate a request to Elasticsearch through the curl command or other tools. -Create an index (data table) using the PUT request, which can specify some configuration parameters and field mappings. -For example, using the curl command to create a file called my_ Index: curl -X PUT "http://localhost:9200/my_index" 3. Data insertion: -Insert data into the index using POST requests. -The data is provided in JSON format, including the fields to be inserted and corresponding values. -For example, using the curl command to_ Insert a document with "id", "name", and "age" fields into the index index: curl -X POST "http://localhost:9200/my_index/_doc" -d '{"id": "1", "name": "John", "age": 30}' 4. Data modification: -Use POST or PUT requests to modify data. -Use the ID of the document to determine which document to modify. -Provide new field values to update the document. -For example, using the curl command to modify the name field of a document with id 1: curl -X POST "http://localhost:9200/my_index/_doc/1/_update" -d '{"doc": {"name": "Jane"}}' 5. Data Query: -Use GET requests to query data. -You can use simple query statements, or you can use query DSL (Domain-specific language) to build complex queries. -For example, using the curl command to query a document with a name field of "John": curl -X GET "http://localhost:9200/my_index/_search?q=name:John" 6. Data deletion: -Use DELETE to request the deletion of a document or entire index. -For example, using the curl command to delete the name 'my'_ Index: curl -X DELETE "http://localhost:9200/my_index" The above is an introduction to the installation and use of Elasticsearch, including the installation process of the database and how to create data tables, insert, modify, query, and delete data. With these basic operations, you can start using Elasticsearch to search and analyze a large amount of data.