Install Elasticsearch 2.1 on CentOS 6 This article will cover install Elasticsearch 2.x version on CentOS 6. Also guideline to change to Default Cluster and Index settings in Elasticsearch 2.x. So Let’s start with prerequisites Prerequisites: Elasticsearch needed at least Java 7. Install Elasticsearch 2.x On CentOS 6 using Elasticsearch Repository Install Public Signing Key:…
Install Logstash 5.0 in Linux In this article I will cover installation of the Logstash 5.0 in Linux and basic configuration apart from it I will cover validation of Logstash configuration. How Can we start and stop Logstash and verifying that everything is running properly Let’s start with What is Logstash? What is Logstash? Logstash…
What are the slow log settings in Elasticsearch? Elasticsearch provide facility to keep track of your slow queries while indexing and searching data. It helps us to identify the slow elasticsearch query. You can configure slow log threshold according to your requirement. Its just depends on your architecture. Sometimes 2s query are fine for us…
Partial Update in Elasticsearch Partial update in elasticsearch works same as updating whole document in Elasticsearch. This process retrieve the document, change it and reindex it again. In elasticsearch partial update is done through Update API. Update API also support scripting language to update a document. We can write our own logic in script like…
Documents in Elasticsearch are always immutable we cannot replace or change them directly. If we require updating document in Elasticsearch then we need to reindex or replace it. We can change an existing document by using Index API as well. Elasticsearch delete the old document automatically and add a new document internally. Updating Document in…
How to increase or decrease replica in Elasticsearch You can change number of replicas in live Elasticsearch Cluster using Indices APIs update indices settings. Update number of replicas for all indices: curl -XPUT ‘localhost:9200/_settings’ -d ‘ { “index” : { “number_of_replicas” : 2 } }’ Update number of replicas for a single index or multiple…
How to add new node in elasticsearch cluster? Here is step by step guideline to add new node in existing elasticsearch cluster. 1) Elasticsearch Installation: Install elasticsearch in new node. Elasticsearch version should be same as existing cluster nodes. If you are not aware then you may refer my these guideline Install Elasticsearch 5.0 on…
You might get this problem with fielddata size limit. fielddata size limit is checked after the query data is loaded. When your elasticsearch query tried to load data more than the fielddata available memory then you would get the OutOfMemoryException. Caused by: org.elasticsearch.common.breaker.CircuitBreakingException: Data too large, data for field [parent/child id cache] would be larger…
Delete a git branch This article will demonstrate, how we can delete a git branch from local or remote git repository. Syntax: git branch -d<branch> git branch -d test-branch If you face any error like “error: The branch ‘test-branch’ is not fully merged” and you are still want to delete this branch then you can…
I am using two tool to benchmark query performance of an Elasticsearch server. Initially I faced problem to test elasticsearch query performance for large elasticsearch query as it’s very hard to put large query in command line. Then I found these two tool, having support to pass json as a POST parameter. Tools are :…
