The basic syntax for creating a flowchart in Mermaid starts with `graph TD` for top-down or `graph LR` for left-right direction, followed by node definitions and connections:

``` graph TD A[Start] –> B[Process] B –> C[End] ```

Different node shapes in Mermaid are defined using various brackets:

• `A[Rectangle]`
• `B(Rounded Rectangle)`
• `C((Circle))`
• `D{Diamond}`
• `E[/Parallelogram/]`
• `F[\Parallelogram\]`
• `G{{Hexagon}}`

To represent a connection between two AWS services in a Mermaid diagram, use the arrow syntax:

``` graph TD A[S3] –>|Upload| B[Lambda] ```

This shows data flowing from S3 to Lambda, with the label "Upload" on the arrow.

To group AWS services together in a Mermaid diagram, use the `subgraph` syntax:

``` subgraph AWS Cloud A[S3] B[Lambda] C[DynamoDB] end ```

This creates a box around the specified services, grouping them visually.

The initial steps of the audio processing pipeline are:

1. Users upload audio to S3 raw audio bucket.
2. A Lambda function triggers a transcribe audio job.
3. Amazon Transcribe service processes the audio.
4. The transcribed audio is stored in an S3 transcribed audio bucket.

Metadata is handled by storing it in DynamoDB at various stages of the pipeline:

• After the transcription job (step 4)
• After the translation job (step 7)
• After the text insights job (step 10)

This allows for tracking and querying of metadata throughout the process.

The user query flow is as follows:

1. Users send a query to the API Gateway GET match API.
2. The API Gateway triggers a Lambda GET match function.
3. The Lambda function queries Amazon Kendra for search results.
4. Kendra searches the translated text in the S3 bucket.
5. The Lambda function also queries DynamoDB for metadata.
6. Results are returned to the user through the API Gateway.

The AWS services involved in the user query process are:

1. API Gateway
2. Lambda
3. Amazon Kendra
4. S3 (for storing translated text)
5. DynamoDB (for metadata)

These services work together to process user queries and return relevant results.