Move crates under a sub folder to clean up the code

crates/milli/src/update/indexer_config.rs

@@ -0,0 +1,32 @@
+use grenad::CompressionType;
+
+use crate::thread_pool_no_abort::ThreadPoolNoAbort;
+
+#[derive(Debug)]
+pub struct IndexerConfig {
+    pub log_every_n: Option<usize>,
+    pub max_nb_chunks: Option<usize>,
+    pub documents_chunk_size: Option<usize>,
+    pub max_memory: Option<usize>,
+    pub chunk_compression_type: CompressionType,
+    pub chunk_compression_level: Option<u32>,
+    pub thread_pool: Option<ThreadPoolNoAbort>,
+    pub max_positions_per_attributes: Option<u32>,
+    pub skip_index_budget: bool,
+}
+
+impl Default for IndexerConfig {
+    fn default() -> Self {
+        Self {
+            log_every_n: None,
+            max_nb_chunks: None,
+            documents_chunk_size: None,
+            max_memory: None,
+            chunk_compression_type: CompressionType::None,
+            chunk_compression_level: None,
+            thread_pool: None,
+            max_positions_per_attributes: None,
+            skip_index_budget: false,
+        }
+    }
+}