Refactor embedder implementation for Linux platforms to use trait objects

This change modifies the semantic search client to use Box<dyn TextEmbedderTrait>
on Linux platforms instead of directly using CandleTextEmbedder. This provides
more flexibility and consistency with the implementation on macOS and Windows,
allowing for better extensibility and polymorphic behavior across all platforms.

Author: kennvene-aws

crates/semantic_search_client/src/client/embedder_factory.rs

@@ -41,11 +41,11 @@ pub fn create_embedder(embedding_type: EmbeddingType) -> Result<Box<dyn TextEmbe
 ///
 /// A text embedder instance
 #[cfg(not(any(target_os = "macos", target_os = "windows")))]
-pub fn create_embedder(embedding_type: EmbeddingType) -> Result<CandleTextEmbedder> {
-    let embedder = match embedding_type {
-        EmbeddingType::Candle => CandleTextEmbedder::new()?,
+pub fn create_embedder(embedding_type: EmbeddingType) -> Result<Box<dyn TextEmbedderTrait>> {
+    let embedder: Box<dyn TextEmbedderTrait> = match embedding_type {
+        EmbeddingType::Candle => Box::new(CandleTextEmbedder::new()?),
         #[cfg(test)]
-        EmbeddingType::Mock => MockTextEmbedder::new(384),
+        EmbeddingType::Mock => Box::new(MockTextEmbedder::new(384)),
     };
 
     Ok(embedder)

crates/semantic_search_client/src/client/implementation.rs

@@ -71,7 +71,7 @@ pub struct SemanticSearchClient {
     embedder: Box<dyn TextEmbedderTrait>,
     /// Text embedder for generating embeddings (Linux only)
     #[cfg(not(any(target_os = "macos", target_os = "windows")))]
-    embedder: CandleTextEmbedder,
+    embedder: Box<dyn TextEmbedderTrait>,
 }
 impl SemanticSearchClient {
     /// Create a new semantic search client