diff --git a/src/configuration/ConfigEditor.tsx b/src/configuration/ConfigEditor.tsx
index efa011c..b169d52 100644
--- a/src/configuration/ConfigEditor.tsx
+++ b/src/configuration/ConfigEditor.tsx
@@ -49,24 +49,6 @@ export const QuickwitDetails = ({ value, onChange }: DetailsProps) => {
               width={40}
             />
           </InlineField>
-          <InlineField label="Timestamp field" labelWidth={26} tooltip="Timestamp field of your index. Required.">
-            <Input
-              id="quickwit_index_timestamp_field"
-              value={value.jsonData.timeField}
-              onChange={(event) => onChange({ ...value, jsonData: {...value.jsonData, timeField: event.currentTarget.value}})}
-              placeholder="timestamp"
-              width={40}
-            />
-          </InlineField>
-          <InlineField label="Timestamp output format" labelWidth={26} tooltip="If you don't remember the output format, check the datasource and the error message will give you a hint.">
-            <Input
-              id="quickwit_index_timestamp_field_output_format"
-              value={value.jsonData.timeOutputFormat}
-              onChange={(event) => onChange({ ...value, jsonData: {...value.jsonData, timeOutputFormat: event.currentTarget.value}})}
-              placeholder="unix_timestamp_millisecs"
-              width={40}
-            />
-          </InlineField>
           <InlineField label="Message field name" labelWidth={26} tooltip="Field used to display a log line in the Explore view">
             <Input
               id="quickwit_log_message_field"
diff --git a/src/configuration/mocks.ts b/src/configuration/mocks.ts
index dc8c621..c129106 100644
--- a/src/configuration/mocks.ts
+++ b/src/configuration/mocks.ts
@@ -4,8 +4,6 @@ import { QuickwitOptions } from 'quickwit';
 
 export function createDefaultConfigOptions(): DataSourceSettings<QuickwitOptions> {
   return createDatasourceSettings<QuickwitOptions>({
-    timeField: 'timestamp',
-    timeOutputFormat: 'unix_timestamp_millisecs',
     logMessageField: 'test.message',
     logLevelField: 'test.level',
     index: 'test',
diff --git a/src/datasource.ts b/src/datasource.ts
index 36cd0a2..7a0fc76 100644
--- a/src/datasource.ts
+++ b/src/datasource.ts
@@ -58,7 +58,6 @@ export class QuickwitDataSource
 {
   index: string;
   timeField: string;
-  timeOutputFormat: string;
   logMessageField?: string;
   logLevelField?: string;
   queryBuilder: ElasticQueryBuilder;
@@ -72,13 +71,20 @@ export class QuickwitDataSource
     super(instanceSettings);
     const settingsData = instanceSettings.jsonData || ({} as QuickwitOptions);
     this.index = settingsData.index || '';
-    this.timeField = settingsData.timeField || '';
-    this.timeOutputFormat = settingsData.timeOutputFormat || '';
-    this.logMessageField = settingsData.logMessageField || '';
-    this.logLevelField = settingsData.logLevelField || '';
+    this.timeField = ''
     this.queryBuilder = new ElasticQueryBuilder({
       timeField: this.timeField,
     });
+    from(this.getResource('indexes/' + this.index + '/describe')).pipe(
+      map(config => config.timestamp_field_name)
+    ).subscribe(result => {
+      this.timeField = result;
+      this.queryBuilder = new ElasticQueryBuilder({
+        timeField: this.timeField,
+      });
+    });
+    this.logMessageField = settingsData.logMessageField || '';
+    this.logLevelField = settingsData.logLevelField || '';
     this.dataLinks = settingsData.dataLinks || [];
     this.languageProvider = new ElasticsearchLanguageProvider(this);
   }
@@ -104,12 +110,7 @@ export class QuickwitDataSource
         message: 'Cannot save datasource, `index` is required',
       };
     }
-    if (this.timeField === '' ) {
-      return {
-        status: 'error',
-        message: 'Cannot save datasource, `timeField` is required',
-      };
-    }
+
     return lastValueFrom(
       from(this.getResource('indexes/' + this.index)).pipe(
         mergeMap((indexMetadata) => {
@@ -145,16 +146,16 @@ export class QuickwitDataSource
     }
     let fields = getAllFields(indexMetadata.index_config.doc_mapping.field_mappings);
     let timestampField = fields.find((field) => field.json_path === this.timeField);
+
     // Should never happen.
     if (timestampField === undefined) {
       return `No field named '${this.timeField}' found in the doc mapping. This should never happen.`;
     }
-    if (timestampField.field_mapping.output_format !== this.timeOutputFormat) {
-      return `Timestamp output format is declared as '${timestampField.field_mapping.output_format}' in the doc mapping, not '${this.timeOutputFormat}'.`;
-    }
+
+    let timeOutputFormat = timestampField.field_mapping.output_format || 'unknown';
     const supportedTimestampOutputFormats = ['unix_timestamp_secs', 'unix_timestamp_millis', 'unix_timestamp_micros', 'unix_timestamp_nanos', 'iso8601', 'rfc3339'];
-    if (!supportedTimestampOutputFormats.includes(this.timeOutputFormat)) {
-      return `Timestamp output format '${this.timeOutputFormat} is not yet supported.`;
+    if (!supportedTimestampOutputFormats.includes(timeOutputFormat)) {
+      return `Timestamp output format '${timeOutputFormat} is not yet supported.`;
     }
     return;
   }
diff --git a/src/mocks.ts b/src/mocks.ts
index 349c4b5..218b0a2 100644
--- a/src/mocks.ts
+++ b/src/mocks.ts
@@ -38,8 +38,6 @@ export function createElasticDatasource(
     access: 'proxy',
     url: '',
     jsonData: {
-      timeField: '',
-      timeOutputFormat: '',
       index: '',
       ...jsonData,
     },
diff --git a/src/quickwit.ts b/src/quickwit.ts
index 7688a65..a7b4163 100644
--- a/src/quickwit.ts
+++ b/src/quickwit.ts
@@ -2,8 +2,6 @@ import { DataSourceJsonData } from "@grafana/data";
 import { DataLinkConfig } from "types";
 
 export interface QuickwitOptions extends DataSourceJsonData {
-    timeField: string;
-    timeOutputFormat: string;
     interval?: Interval;
     logMessageField?: string;
     logLevelField?: string;