Briefly, this error occurs when the configured timeout for LDAP (Lightweight Directory Access Protocol) search in Elasticsearch is set to a value that is less than the minimum supported time. This could lead to premature termination of LDAP searches. To resolve this issue, you can increase the LDAP search timeout to a value that is equal to or greater than the minimum supported time. Alternatively, you can optimize your LDAP queries to ensure they complete within the set timeout period. Lastly, ensure your LDAP server is not overloaded or experiencing network issues, which could slow down search responses.
This guide will help you check for common problems that cause the log ” ldap_search timeout [{}] is less than the minimum supported search ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, plugin.
Overview
Search refers to the searching of documents in an index or multiple indices. The simple search is just a GET API request to the _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 means the request was completed successfully.
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 2,
"successful" : 2,
"failed" : 0
},
"hits" : {
"total" : 2,
"max_score" : 1.0,
"hits" : [
...
]
}
}Notes and good things to know
- 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.
Log Context
Log “ldap_search timeout [{}] is less than the minimum supported search ” classname is SessionFactory.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
this.config = config;
this.logger = LogManager.getLogger(getClass());
TimeValue searchTimeout = config.getSetting(SessionFactorySettings.TIMEOUT_LDAP_SETTING;
() -> SessionFactorySettings.TIMEOUT_DEFAULT);
if (searchTimeout.millis()
