We will learn how to do upsert operation in OpenSearch. There are couple of ways to do it, one using Index operation & another using Update operation. But how they work is different. So we will have to choose carefully based on our use case. Upsert using Index operation: Index operation by default does upsert. … Read more
Here we will learn how to do common CRUD operations in OpenSearch using Java SDK. Basically we will learn how to create, update, index, get & delete document in OpenSearch from a Java application. By the way, this post is regarding CRUD operations on single document. For doing OpenSearch bulk operations in Java, I have … Read more
Here we will learn the basic code to do bulk operation in OpenSearch using Java SDK. We will need below dependencies in our Gradle project. This is part of build.gradle file. implementation ‘org.opensearch.client:opensearch-rest-client: 2.3.0’ implementation ‘org.opensearch.client:opensearch-java:2.0.0’ For maven projects, we need to add the dependencies in pom.xml file. As we know, OpenSearch provides bulk operation … Read more
Here we will see how to write OpenSearch multi-match query using Java SDK. OpenSearch multi-match query is supported for String type fields only. We will write code in Java to implement that. Also, we will write some Java code which can be used to emulate multi-match query for non-String data type fields like Integer, Long, … Read more
Here we will learn how to create OpenSearch client using Java SDK. We will see how to connect to an OpenSearch cluster from a Java application for both AWS & non-AWS environments. OpenSearchClient for non-AWS environment: For a Gradle project, we need to add below dependencies in build.gradle file. For maven project, we would need … Read more
As I mentioned earlier, I use LocalStack to emulate AWS services during development phase. It works more or less well. Recently I faced a problem with LocalStack OpenSearch instance. I created one OpenSearch cluster using LocalStack. My LocalStack is installed via docker-compose file & it runs in a container. Now I have developed a Java … Read more
Most of us have encountered below error while executing Python script: The problem is also pretty well known. Python prefers spaces over tabs. And your code editor might be configured to add tab for indentation. If you modify a Python script, then you might get a mix of space & tab in the script. Python … Read more
First things first. Here we won’t be discussing mocking of Java enum or final class using PowerMock framework. That is already discussed in tons of places & one of the main reason why people tend to use PowerMock.Here we will be discussing mocking of enum or final classes with Mockito framework only. The feature has … Read more
Dealing with Recurrence Rule can be pain. I have seen people facing problem in understanding & parsing Rrule though we have a detailed RFC around it. I guess difficulty comes from the fact that there are so many different recurrence patterns to deal with.Here we would be exploring a few libraries to find out last … Read more
Writing Junit test cases for a multithreaded program can be tricky. For unit test, you need a predictable result to validate against. Let’s say that ExecutorService is running two tasks in parallel in two different threads. You want to put the results back in a list. Then how would you know which result gets stored … Read more