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outline What is Elasticsearch? Elasticsearch, a distributed, high-performance, highly available, scalable search and analysis system. Applicable scenarios of Elasticsearch E-commerce website searchData analysisBI systemLog analysis elk, etc Lucene and Elasticsearch Lucene Lucene is a sub project of the jakarta project team of apache So ...

The name is very long, and the program is as long as the name. It is estimated that it is mainly to increase the amount of code reading (increase the difficulty) There are many menus, so you don't copy the code. The important contents are as follows: wroking's job is to earn money. After watching it for a long time, I feel useless. I ask for ...

Original title: Spring certified China Education Management Center - Spring Data MongoDB tutorial 15 (content source: Spring China Education Management Center)18.7.1. Save using the registered Spring converterThe following example shows the implementation org.bson.Document of Converter converting from Person object to a:import org.springframewo ...

1. What is the meta model? Use sharing to support large numbers of fine-grained objects efficiently. Flyweight Pattern: using shared objects can effectively support a large number of fine-grained objects. Human words: reuse objects and save memory. 2. Meta mode definition ① , Flyweight - Abstract meta role Is an abstract class of a ...

The principle and basic implementation of dynamic multiple data sources have been described in the last two times. The previous data source configuration is to configure multiple data sources from application.yml. Here, we will expand and supplement other scenarios. How to read the data source without configuring it from application.yml, so as ...

1, Foreword    learning python a while ago, I wrote a game of stone, scissors and paper with the purpose of learning while practicing. The execution method is to directly execute python code in the shell environment, Python learning notes scissors stone cloth Let the baby play. The baby can play with stone, scissors and paper by choo ...