This is for documenting the lessons and knowledge gained out of using Elastic Search from real world projects�

• About the indexing operation and real time GET and index refresh rate

  • The index is not updated asynchronously, when you index data its applied to the shard and the replicas in a sync manner including writing to a transaction log. A "fresh" view of the content to be searchable is opened every 1 second by default (thats NRT).
  • [NRT-search-with-elastic-search][1]
  • [Realtime GET #1060][2]

• About the stored fields and _source document

  • That's exactly what elasticsearch does for you when a field is not stored (default) and the _source field is enabled (default too).
  • [why-do-i-need-storeyes-in-elasticsearch][3]

• JetSlide Uses Elastic Search as Database

  • [jetslide-uses-elasticsearch-as-database][4]

• When and why to use routing in ES for indexing/searching?

  • [Over-allocation of shards][5]
  • [When-Why-to-use-Routing-for-indexing-searching][6]
  • [some-ES-stats-at-yfrog-com][7]

• Index alias use cases

  • [I'm loving ElasticSearch index alias feature][8]

• Aggregations

  • elasticsearch-aggregations

• Null Values

  • null value mapping in ElasticSearch

• Scroll

  • Scroll Questions
  • scroll aggregations
  • disk-based field data a.k.a. doc values

1. Spatial Search ElasticSearch tutorial
2. Using Elastic Search for geo-spatial search

• Distributed Diagram
  • [distributed-diagram][9]
• Road to a Distributed Search Engine
• elasticsearch ajug presentation

• View the current settings for all indexes curl -XGET 'localhost:9200/_settings?pretty=true'

• How to create backup of Elastic Search using rsync?
  • [how-to-backup-elasticsearch-with-rsync][10]
• How to leverage index aliases when making changes to indexes like configuration changes without any production glitches?
  • [indices-aliases][11]
  • [the-use-of-aliases-in-elasticsearch][12]
• How to provision ES in a cost effective manner?
  • [qbox.io][13]
• is-there-a-smarter-way-to-reindex-elasticsearch
• re-index
• changing mapping with zero downtime
• elasticsearch-curls
• A full feature elasticsearch reindex tool
• Reindexing Content in Elasticsearch
• ElasticSearch pre-flight checklist [1]: http://elasticsearch-users.115913.n3.nabble.com/NRT-search-with-elastic-search-td3244655.html [2]: elastic/elasticsearch#1060 [3]: http://stackoverflow.com/questions/17103047/why-do-i-need-storeyes-in-elasticsearch [4]: http://karussell.wordpress.com/2011/07/13/jetslide-uses-elasticsearch-as-database/ [5]: https://groups.google.com/forum/?fromgroups#!searchin/elasticsearch/data$20flow/elasticsearch/49q-_AgQCp8/MRol0t9asEcJ [6]: http://elasticsearch-users.115913.n3.nabble.com/When-Why-to-use-Routing-for-indexing-searching-td3789570.html [7]: http://elasticsearch-users.115913.n3.nabble.com/some-ES-stats-at-yfrog-com-td3759891.html [8]: https://twitter.com/otisg/status/160128277497913345 [9]: http://www.elasticsearch.org/videos/distributed-diagram/ [10]: http://karussell.wordpress.com/2011/07/10/how-to-backup-elasticsearch-with-rsync/ [11]: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-aliases.html [12]: http://paulsabou.com/blog/2012/04/15/the-use-of-aliases-in-elasticsearch/ [13]: http://qbox.io/

1. How we optimized 100 sec elasticsearch queries to be under a sub second
2. Elasticsearch in Production
3. Thoughts on Launching and Scaling Elasticsearch

1. elasticsearch-head
2. elasticseach-hq

1. redesigned percolator
2. introduction to percolator
3. Percolator for alerts between specific time intervals

1. Exact Substring Searches in ElasticSearch