Add Milvus#remove_texts() method

lib/langchain/vectorsearch/milvus.rb

@@ -39,6 +39,21 @@ def add_texts(texts:)
       )
     end
 
+    # Deletes a list of texts in the index
+    #
+    # @param ids [Array<Integer>] The ids of texts to delete
+    # @return [Boolean] The response from the server
+    def remove_texts(ids:)
+      raise ArgumentError, "ids must be an array" unless ids.is_a?(Array)
+      # Convert ids to integers if strings are passed
+      ids = ids.map(&:to_i)
+
+      client.entities.delete(
+        collection_name: index_name,
+        expression: "id in #{ids}"
+      )
+    end
+
     # TODO: Add update_texts method
 
     # Create default schema
@@ -83,7 +98,7 @@ def create_default_schema
     # @return [Boolean] The response from the server
     def create_default_index
       client.indices.create(
-        collection_name: "Documents",
+        collection_name: index_name,
         field_name: "vectors",
         extra_params: [
           {key: "metric_type", value: "L2"},

spec/langchain/vectorsearch/milvus_spec.rb

@@ -89,6 +89,18 @@
     end
   end
 
+  describe "remove_texts" do
+    let(:response) { {"status" => {}, "IDs" => {"IdField" => nil}, "delete_cnt" => 1} }
+
+    before do
+      allow(subject.client).to receive_message_chain(:entities, :delete).and_return(response)
+    end
+
+    it "adds texts" do
+      expect(subject.remove_texts(ids: [450847466900986695])).to eq(response)
+    end
+  end
+
   describe "#similarity_search_by_vector" do
     before do
       allow(subject.client.collections).to receive(:load).and_return(true)