diff --git a/pkg/quickwit/quickwit.go b/pkg/quickwit/quickwit.go
index 36ba450..c582808 100644
--- a/pkg/quickwit/quickwit.go
+++ b/pkg/quickwit/quickwit.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -37,6 +38,23 @@ type QuickwitMapping struct {
 	} `json:"index_config"`
 }
 
+type QuickwitCreationErrorPayload struct {
+	Message    string `json:"message"`
+	StatusCode int    `json:"status"`
+}
+
+func marshallErrorAsException(statusCode int, message string) error {
+	var payload QuickwitCreationErrorPayload
+	payload.Message = message
+	payload.StatusCode = statusCode
+	json, err := json.Marshal(payload)
+	if nil != err {
+		return err
+	}
+
+	return errors.New(string(json))
+}
+
 func getTimestampFieldInfos(index string, qwUrl string, cli *http.Client) (string, string, error) {
 	mappingEndpointUrl := qwUrl + "/indexes/" + index
 	qwlog.Info("Calling quickwit endpoint: " + mappingEndpointUrl)
@@ -48,10 +66,11 @@ func getTimestampFieldInfos(index string, qwUrl string, cli *http.Client) (strin
 	}
 
 	statusCode := r.StatusCode
+
 	if statusCode < 200 || statusCode >= 400 {
-		errMsg := fmt.Sprintf("Error when calling url = %s: statusCode = %d", mappingEndpointUrl, statusCode)
+		errMsg := fmt.Sprintf("Error when calling url = %s", mappingEndpointUrl)
 		qwlog.Error(errMsg)
-		return "", "", fmt.Errorf(errMsg)
+		return "", "", marshallErrorAsException(statusCode, errMsg)
 	}
 
 	defer r.Body.Close()
@@ -59,7 +78,7 @@ func getTimestampFieldInfos(index string, qwUrl string, cli *http.Client) (strin
 	if err != nil {
 		errMsg := fmt.Sprintf("Error when calling url = %s: err = %s", mappingEndpointUrl, err.Error())
 		qwlog.Error(errMsg)
-		return "", "", err
+		return "", "", marshallErrorAsException(statusCode, errMsg)
 	}
 
 	var payload QuickwitMapping
@@ -67,7 +86,7 @@ func getTimestampFieldInfos(index string, qwUrl string, cli *http.Client) (strin
 	if err != nil {
 		errMsg := fmt.Sprintf("Unmarshalling body error: err = %s, body = %s", err.Error(), (body))
 		qwlog.Error(errMsg)
-		return "", "", fmt.Errorf(errMsg)
+		return "", "", marshallErrorAsException(statusCode, errMsg)
 	}
 
 	timestampFieldName := payload.IndexConfig.DocMapping.TimestampField
@@ -82,7 +101,7 @@ func getTimestampFieldInfos(index string, qwUrl string, cli *http.Client) (strin
 	if timestampFieldFormat == "undef" {
 		errMsg := fmt.Sprintf("No format found for field: %s", string(timestampFieldName))
 		qwlog.Error(errMsg)
-		return timestampFieldName, "", fmt.Errorf(errMsg)
+		return timestampFieldName, "", marshallErrorAsException(statusCode, errMsg)
 	}
 
 	qwlog.Info(fmt.Sprintf("Found timestampFieldName = %s, timestampFieldFormat = %s", timestampFieldName, timestampFieldFormat))
diff --git a/src/datasource.ts b/src/datasource.ts
index f7547dc..dc09b12 100644
--- a/src/datasource.ts
+++ b/src/datasource.ts
@@ -51,6 +51,7 @@ import { bucketAggregationConfig } from 'components/QueryEditor/BucketAggregatio
 import { isBucketAggregationWithField } from 'components/QueryEditor/BucketAggregationsEditor/aggregations';
 import ElasticsearchLanguageProvider from 'LanguageProvider';
 import { ReactNode } from 'react';
+import { extractJsonPayload } from 'utils';
 
 export const REF_ID_STARTER_LOG_VOLUME = 'log-volume-';
 
@@ -91,8 +92,18 @@ export class QuickwitDataSource
         let timestampField = fields.find((field) => field.json_path === timestampFieldName);
         let timestampFormat = timestampField ? timestampField.field_mapping.output_format || '' : ''
         let timestampFieldInfos = { 'field': timestampFieldName, 'format': timestampFormat }
-        console.log("timestampFieldInfos = " + JSON.stringify(timestampFieldInfos))
         return timestampFieldInfos
+      }),
+      catchError((err) => {
+        if (!err.data || !err.data.error) {
+          let err_source = extractJsonPayload(err.data.error)
+          if(!err_source) {
+            throw err
+          }
+        }
+
+        // the error will be handle in the testDatasource function
+        return of({'field': '', 'format': ''})
       })
     ).subscribe(result => {
       this.timeField = result.field;
@@ -143,7 +154,14 @@ export class QuickwitDataSource
           return of({ status: 'success', message: `Index OK. Time field name OK` });
         }),
         catchError((err) => {
-          if (err.status === 404) {
+          if (err.data && err.data.error) {
+            let err_source = extractJsonPayload(err.data.error)
+            if (err_source) {
+              err = err_source
+            }
+          }
+
+          if (err.status && err.status === 404) {
             return of({ status: 'error', message: 'Index does not exists.' });
           } else if (err.message) {
             return of({ status: 'error', message: err.message });
@@ -377,7 +395,7 @@ export class QuickwitDataSource
         return _map(filteredFields, (field) => {
           return {
             text: field.json_path,
-            value: typeMap[field.field_mapping.type],
+            value: typeMap[field.field_mapping.type]
           };
         });
       })
diff --git a/src/utils.ts b/src/utils.ts
index 5b8d940..a6747c3 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -13,6 +13,20 @@ export const describeMetric = (metric: MetricAggregation) => {
   return `${metricAggregationConfig[metric.type].label} ${metric.field}`;
 };
 
+export const extractJsonPayload = (msg: string) => {
+  const match = msg.match(/{.*}/);
+
+  if (!match) {
+    return null;
+  }
+
+  try {
+      return JSON.parse(match[0]);
+  } catch (error) {
+      return null;
+  }
+}
+
 /**
  * Utility function to clean up aggregations settings objects.
  * It removes nullish values and empty strings, array and objects