Elasticsearch Search

Get an Elasticsearch Check-Up

Check if your ES issues are caused from misconfigured settings

2-min process

Perform an Elasticsearch Check Up (2 min process) 

Search in Elasticsearch

What it is

Search refers to the searching of documents in an index or multiple indices. The simple search is just a GET request to _search endpoint. The search query can either be provided in query string or through  a request body.

Examples

When looking for any documents in this index, if search parameters are not provided, every document is a hit and by default 10 hits will be returned.

GET my_documents/_search

A JSON object is returned in response to a search query. A 200 response code will mean the request completed successfully.

{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 2,
"successful" : 2,
"failed" : 0
},
"hits" : {
"total" : 2,
"max_score" : 1.0,
"hits" : [
...
]
}
}
Notes
  • Distributed search is challenging and every shard of the index needs to be searched for hits, and then those hits are combined into a single sorted list as a final result.
  • There are two phases of search: the query phase and the fetch phase.
  • In the query phase, the query is executed on each shard locally and top hits are returned to the coordinating node. The coordinating node merges the results and creates a global sorted list. 
  • In the fetch phase, the coordinating node brings the actual documents for those hit IDs and returns them to the requesting client.
  • A coordinating node needs enough memory and CPU in order to handle the fetch phase.

About Opster

Incorporating deep knowledge and broad history of Elasticsearch issues. Opster solution identifies and predicts root causes of Elasticsearch problems, provides recommendations and can automatically perform various actions to manage, troubleshoot and prevent issues

Learn more: Glossary | Blog| Troubleshooting guides

Need help with any Elasticsearch issue ? Contact Opster

Did this page help you?

Check your Elasticsearch Settings  


Click below to learn how to fix common problems related to these concepts
« Back to Index