Struct IndexConfig 

pub struct IndexConfig {
    pub num_threads: usize,
    pub num_indexing_threads: usize,
    pub num_compression_threads: usize,
    pub term_cache_blocks: usize,
    pub store_cache_blocks: usize,
    pub max_indexing_memory_bytes: usize,
    pub merge_policy: Box<dyn MergePolicy>,
    pub optimization: IndexOptimization,
    pub reload_interval_ms: u64,
    pub max_concurrent_merges: usize,
    pub merge_bp_time_budget: Option<Duration>,
    pub bp_memory_budget_bytes: usize,
}

Index configuration

Fields

num_threads: usize

Number of threads for CPU-intensive tasks (search parallelism)

num_indexing_threads: usize

Number of parallel segment builders (documents distributed round-robin)

num_compression_threads: usize

Number of threads for parallel block compression within each segment

term_cache_blocks: usize

Block cache size for term dictionary per segment

store_cache_blocks: usize

Block cache size for document store per segment

max_indexing_memory_bytes: usize

Max memory (bytes) across all builders before auto-commit (global limit)

merge_policy: Box<dyn MergePolicy>

Merge policy for background segment merging

optimization: IndexOptimization

Index optimization mode (adaptive, size-optimized, performance-optimized)

reload_interval_ms: u64

Reload interval in milliseconds for IndexReader (how often to check for new segments)

max_concurrent_merges: usize

Maximum number of concurrent background merges (default: 4)

merge_bp_time_budget: Option<Duration>

Wall-clock budget for merge-time BP reorder per field (only applies when the index has reorder_on_merge). A truncated pass still writes a valid, better-ordered segment; it is marked bp_converged = false and the background optimizer deepens it later (warm-started). None = unbudgeted (BP runs to full depth inside the merge, which can hold a merge slot for 10-30+ minutes on 10M+ doc outputs).

bp_memory_budget_bytes: usize

Memory budget (bytes) for the BP forward index during reorder passes (merge-time and background). When a large segment’s forward index would exceed this, the highest-df dims are dropped from BP’s input (logged loudly) — clustering quality degrades gracefully. Production evidence: 18M-doc merges exceed the 2 GB default and drop ~10% of eligible dims; hosts with headroom should raise this.

Trait Implementations

impl Clone for IndexConfig

fn clone(&self) -> IndexConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for IndexConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for IndexConfig

fn default() -> Self

Returns the “default value” for a type.