public void setSessionId(String sessionId) {
        this.sessionId = sessionId;
    }
<p>
The unique identifier of the session. When you first make a <code>RetrieveAndGenerate</code> request, Amazon
Bedrock automatically generates this value. You must reuse this value for all subsequent requests in the same
conversational session. This value allows Amazon Bedrock to maintain context and knowledge from previous
interactions. You can't explicitly set the <code>sessionId</code> yourself.
</p>

@param sessionId
       The unique identifier of the session. When you first make a <code>RetrieveAndGenerate</code> request,
       Amazon Bedrock automatically generates this value. You must reuse this value for all subsequent requests
       in the same conversational session. This value allows Amazon Bedrock to maintain context and knowledge
       from previous interactions. You can't explicitly set the <code>sessionId</code> yourself.
aws-java-sdk-bedrockagentruntime/src/main/java/com/amazonaws/services/bedrockagentruntime/model/RetrieveAndGenerateRequest.java