feat: rewrite Elasticsearch index and search code to achieve Elasticsearch vector and full-text search (#7641)

Co-authored-by: haokai <haokai@shuwen.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: Bowen Liang <bowenliang@apache.org>
Co-authored-by: wellCh4n <wellCh4n@foxmail.com>

api/configs/middleware/vdb/elasticsearch_config.py

@@ -0,0 +1,30 @@
+from typing import Optional
+
+from pydantic import Field, PositiveInt
+from pydantic_settings import BaseSettings
+
+
+class ElasticsearchConfig(BaseSettings):
+    """
+    Elasticsearch configs
+    """
+
+    ELASTICSEARCH_HOST: Optional[str] = Field(
+        description="Elasticsearch host",
+        default="127.0.0.1",
+    )
+
+    ELASTICSEARCH_PORT: PositiveInt = Field(
+        description="Elasticsearch port",
+        default=9200,
+    )
+
+    ELASTICSEARCH_USERNAME: Optional[str] = Field(
+        description="Elasticsearch username",
+        default="elastic",
+    )
+
+    ELASTICSEARCH_PASSWORD: Optional[str] = Field(
+        description="Elasticsearch password",
+        default="elastic",
+    )