From 2d572603db73bd8523d67f585b0063e40ca9ef3e Mon Sep 17 00:00:00 2001
From: Jacob Lee <jacoblee93@gmail.com>
Date: Wed, 4 Sep 2024 12:29:04 -0700
Subject: [PATCH] fix(community): ElasticVectorSearch: exclude metadata filters
 not working due changing to term instead of terms (#6688)

Co-authored-by: Laurens Tsestigh <90600075+LaurensTsestigh@users.noreply.github.com>
---
 .../langchain-community/src/vectorstores/elasticsearch.ts | 7 ++++---
 .../src/vectorstores/tests/elasticsearch.int.test.ts      | 8 ++++++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/libs/langchain-community/src/vectorstores/elasticsearch.ts b/libs/langchain-community/src/vectorstores/elasticsearch.ts
index 14a4ee12ac03..cccc439bb7a9 100644
--- a/libs/langchain-community/src/vectorstores/elasticsearch.ts
+++ b/libs/langchain-community/src/vectorstores/elasticsearch.ts
@@ -343,10 +343,11 @@ export class ElasticVectorSearch extends VectorStore {
           },
         });
       } else if (condition.operator === "exclude") {
+        const toExclude = { [metadataField]: condition.value };
         must_not.push({
-          term: {
-            [metadataField]: condition.value,
-          },
+          ...(Array.isArray(condition.value)
+            ? { terms: toExclude }
+            : { term: toExclude }),
         });
       } else if (condition.operator === "or") {
         should.push({
diff --git a/libs/langchain-community/src/vectorstores/tests/elasticsearch.int.test.ts b/libs/langchain-community/src/vectorstores/tests/elasticsearch.int.test.ts
index 08ec39ac0f57..41045196892a 100644
--- a/libs/langchain-community/src/vectorstores/tests/elasticsearch.int.test.ts
+++ b/libs/langchain-community/src/vectorstores/tests/elasticsearch.int.test.ts
@@ -114,6 +114,14 @@ describe("ElasticVectorSearch", () => {
       },
     ]);
     expect(results2).toHaveLength(1);
+    const results3 = await store.similaritySearch("*", 11, [
+      {
+        field: "a",
+        value: [createdAt],
+        operator: "exclude",
+      },
+    ]);
+    expect(results3).toHaveLength(1);
   });
 
   test.skip("ElasticVectorSearch integration with text splitting metadata", async () => {