Solr 9.x: New Features and Evolution

// Enable vector search
{
  "name": "embedding",
  "type": "knn_vector",
  "dimension": 384,
  "method": {
    "name": "hnsw",
    "class": "solr.HnswVectorStrategy",
    "engine": "lucene",
    "M": 16,
    "efConstruction": 200
  }
}

// Query vector
{
  "query": "{!knn topK=10}embedding:[0.1, 0.2, ...]"
}

// Combine keyword and vector
{
  "query": "(title:search OR {!knn topK=10}embedding:[0.1, 0.2])"
}

// PKI authentication
{
  "authentication": {
    "class": "solr.AuthenticationPlugin",
    "blockUnknown": true
  }
}

// Role-based access
{
  "authorization": {
    "class": "solr.RuleBasedAuthorizationPlugin",
    "permissions": [
      {"name": "read", "role": "reader"},
      {"name": "update", "role": "editor"}
    ]
  }
}

# Trigger auto-scaling
curl "http://localhost:8983/solr/admin/collections?action=CREATESHARD&shard=shard1&collection=products"

// Enable tracing
{
  "tracing": {
    "enabled": true,
    "sampler": "probability",
    "param": 0.01
  }
}

// Concurrent merge scheduling
{
  "mergeScheduler": "solr.ConcurrentMergeScheduler"
}

// Better cache eviction
{
  "cache": {
    "autowarmCount": "100%"
  }
}