Link Search Menu Expand Document Documentation Menu

This version of the OpenSearch documentation is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

k-NN settings

The k-NN plugin adds several new cluster settings.

Cluster settings

Setting Default Description
knn.algo_param.index_thread_qty 1 The number of threads used for graph creation. Keeping this value low reduces the CPU impact of the k-NN plugin, but also reduces indexing performance.
knn.cache.item.expiry.enabled false Whether to remove graphs that have not been accessed for a certain duration from memory.
knn.cache.item.expiry.minutes 3h If enabled, the idle time before removing a graph from memory.
knn.circuit_breaker.unset.percentage 75.0 The native memory usage threshold for the circuit breaker. Memory usage must be below this percentage of knn.memory.circuit_breaker.limit for knn.circuit_breaker.triggered to remain false.
knn.circuit_breaker.triggered false True when memory usage exceeds the knn.circuit_breaker.unset.percentage value.
knn.memory.circuit_breaker.limit 50% The native memory limit for graphs. At the default value, if a machine has 100 GB of memory and the JVM uses 32 GB, the k-NN plugin uses 50% of the remaining 68 GB (34 GB). If memory usage exceeds this value, k-NN removes the least recently used graphs.
knn.memory.circuit_breaker.enabled true Whether to enable the k-NN memory circuit breaker.
knn.plugin.enabled true Enables or disables the k-NN plugin.