Elasticsearch 6.2.2 release, distributed search engine

Elasticsearch 6.2.2 has been released, ElasticSearch is a Lucene-based open source, distributed, RESTful search engine. Designed for cloud computing, to achieve real-time search, stable, reliable, fast, easy to install. Support for data indexing via HTTP using JSON.

Elasticsearch is a highly scalable open-source full-text search and analytics engine. It allows you to store, search, and analyze big volumes of data quickly and in near real time. It is generally used as the underlying engine/technology that powers applications that have complex search features and requirements.

Here are a few sample use-cases that Elasticsearch could be used for:

  • You run an online web store where you allow your customers to search for products that you sell. In this case, you can use Elasticsearch to store your entire product catalog and inventory and provide search and autocomplete suggestions for them.
  • You want to collect log or transaction data and you want to analyze and mine this data to look for trends, statistics, summarizations, or anomalies. In this case, you can use Logstash (part of the Elasticsearch/Logstash/Kibana stack) to collect, aggregate, and parse your data, and then have Logstash feed this data into Elasticsearch. Once the data is in Elasticsearch, you can run searches and aggregations to mine any information that is of interest to you.
  • You run a price alerting platform which allows price-savvy customers to specify a rule like “I am interested in buying a specific electronic gadget and I want to be notified if the price of gadget falls below $X from any vendor within the next month”. In this case you can scrape vendor prices, push them into Elasticsearch and use its reverse-search (Percolator) capability to match price movements against customer queries and eventually push the alerts out to the customer once matches are found.
  • You have analytics/business-intelligence needs and want to quickly investigate, analyze, visualize, and ask ad-hoc questions on a lot of data (think millions or billions of records). In this case, you can use Elasticsearch to store your data and then use Kibana (part of the Elasticsearch/Logstash/Kibana stack) to build custom dashboards that can visualize aspects of your data that are important to you. Additionally, you can use the Elasticsearch aggregations functionality to perform complex business intelligence queries against your data.

Changelog v6.2.2


  • Recovery
    • Synced-flush should not seal index of out of sync replicas #28464 (issue: #10032)

Fix bugs

  • Core
    • Handle throws on tasks submitted to thread pools #28667
    • Fix size blocking queue to not lie about its weight #28557 (issue: #28547)
  • Ingest
    • Guard accessDeclaredMembers for Tika on JDK 10 #28603 (issue: #28602)
    • Fix for bug that prevents pipelines to load that use stored scripts after a restart #28588


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