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+# Write Local Database
+
+The Write Local Database plugin upserts documents into a specified index in an Elasticsearch instance. It allows you to specify an index, documents and an optional identifier to support unique document identification.
+
+## Version
+
+This documentation was created for plugin version 1.0.3.
+
+## Description
+
+The Write Local Database plugin is designed to upsert data into a specified Elasticsearch index. This plugin provides flexible document insertion and updating, utilizing an identifier to manage unique records.
+
+The plugin performs the following steps:
+
+1. **Payload Extraction:** The plugin uses dot notation paths to extract configuration parameters, including the index, documents, and identifier, from the input payload.
+2. **Document Preparation:** The documents can be passed either as a JSON string or an array. If an identifier is provided, it assigns a unique `_id` to each document based on the identifier value.
+3. **Bulk Upsert Operation:** Using Elasticsearch’s bulk upsert, the plugin inserts or updates the specified documents in the defined index.
+4. **Error Handling:** Any errors encountered during these steps are logged and returned via the error port.
+
+## Inputs and Outputs
+
+### Input Port: `payload`
+
+  - Accepts a payload object containing paths to the index, documents and identifier values. Dot notation paths should be used to specify the location of each in the payload.
+
+### Output Ports
+
+  - **Result (result):** Returns a dictionary with the result of the upsert operation.
+
+    **Example Output:**
+
+    ```json
+    {
+      "result": {
+        "inserted": 10,
+        "updated": 5,
+        "errors": []
+      }
+    }
+    ```
+
+  - **Error (error):** Returns an error message if an issue occurs during the upsert process.
+
+    **Example Output:**
+
+    ```json
+    {
+      "message": "Error while upserting data: Invalid index name"
+    }
+    ```
+
+## Configuration
+
+- **Elasticsearch Resource (source):**
+  - Required: Yes
+  - Select your Elasticsearch resource from available connections.
+
+- **Index (index):**
+  - Required: Yes
+  - Define the index where the documents will be upserted. This value is specified using dot notation.
+
+- **Documents (documents):**
+  - Required: Yes
+  - The documents to be upserted. This value is specified using dot notation and should point to a JSON string or list.
+
+- **Identifier (identifier):**
+  - Optional
+  - A unique key used for document upsertion. If provided, each document in the array will be assigned an `_id` based on this identifier.
+
+## JSON Configuration Example
+
+```json
+{
+  "source": "elasticsearch-resource",
+  "index": "event@data.index",
+  "documents": "event@data.documents",
+  "identifier": "event@data.identifier"
+}
+```
+
+## Required Resources
+
+This plugin requires an Elasticsearch resource configured within the platform.
+
+## Event Prerequisites
+
+This plugin can be used with any event that includes data structured for indexing in Elasticsearch.
+
+## Errors
+
+-   **"Index cannot be empty."**
+    
+    -   Occurs if the index value is not provided or accessible in the payload.
+-   **"Document list is invalid or cannot be parsed."**
+    
+    -   Occurs if the document configuration is not a valid JSON or array.
+-   **"Error upserting documents: [error details]"**
+    
+    -   Occurs if there is an issue during the Elasticsearch bulk upsert operation, commonly due to configuration or data issues.