Set the llm-api-key field of the ai-search plugin to optional (#1846)

plugins/wasm-go/extensions/ai-search/README.md

@@ -39,7 +39,7 @@ description: higress 支持通过集成搜索引擎（Google/Bing/Arxiv/Elastics
 |------|----------|----------|--------|------|
 | llmServiceName | string | 必填 | - | LLM服务名称 |
 | llmServicePort | number | 必填 | - | LLM服务端口 |
-| llmApiKey | string | 必填 | - | LLM服务API密钥 |
+| llmApiKey | string | 选填 | - | LLM服务API密钥 |
 | llmUrl | string | 必填 | - | LLM服务API地址 |
 | llmModelName | string | 必填 | - | LLM模型名称 |
 | timeoutMillisecond | number | 选填 | 30000 | API调用超时时间（毫秒） |

plugins/wasm-go/extensions/ai-search/README_EN.md

@@ -39,7 +39,7 @@ It is strongly recommended to enable this feature when using Arxiv or Elasticsea
 |------|-----------|-------------|---------------|-------------|
 | llmServiceName | string | Required | - | LLM service name |
 | llmServicePort | number | Required | - | LLM service port |
-| llmApiKey | string | Required | - | LLM service API key |
+| llmApiKey | string | Optional | - | LLM service API key |
 | llmUrl | string | Required | - | LLM service API URL |
 | llmModelName | string | Required | - | LLM model name |
 | timeoutMillisecond | number | Optional | 30000 | API call timeout (milliseconds) |

plugins/wasm-go/extensions/ai-search/main.go

@@ -196,9 +196,6 @@ func parseConfig(json gjson.Result, config *Config, log wrapper.Log) error {
 			Port: llmServicePort,
 		})
 		llmApiKey := searchRewriteJson.Get("llmApiKey").String()
-		if llmApiKey == "" {
-			return errors.New("llmApiKey not found")
-		}
 		searchRewrite.apiKey = llmApiKey
 		llmUrl := searchRewriteJson.Get("llmUrl").String()
 		if llmUrl == "" {