Increase the summaryRequestTimeout seconds. It will fix this issue.
"analysisPlan": {
"summaryPrompt": "string",
"summaryRequestTimeoutSeconds": 20,
"structuredDataRequestTimeoutSeconds": 20,
"successEvaluationPrompt": "string",
"successEvaluationRubric": "NumericScale",
"successEvaluationRequestTimeoutSeconds": 20,
"structuredDataPrompt": "string",
"structuredDataSchema": {
"type": "string",
"items": {},
"properties": {},
"description": "string",
"required": [
"string"
]
}
}