Remove duplicate _index in search response

docs/en/observability/logs-stream.asciidoc

@@ -365,7 +365,6 @@ You can see the pipeline extracted the `@timestamp` field:
     ...
     "hits": [
       {
-        "_index": ".ds-logs-generic-default-2023.08.09-000001",
         "_index": ".ds-logs-example-default-2023.08.09-000001",
         "_id": "RsWy3IkB8yCtA5VGOKLf",
         "_score": 1,
@@ -389,4 +388,4 @@ Check the following common issues for possible solutions:
 
 - *Timestamp failure* – If your data has inconsistent date formats, you can set `ignore_failure` to `true` for your date processor. This processes logs with correctly formatted dates and ignores those with issues.
 - *Incorrect timezone* – Set your timezone using the `timezone` option on the {ref}/date-processor.html[date processor].
-- *Incorrect timestamp format* – Your timestamp can be a Java time pattern or one of the following formats: ISO8601, UNIX, UNIX_MS, or TAI64N. See the {ref}/mapping-date-format.html[mapping date format] for more information on timestamp formats.
+- *Incorrect timestamp format* – Your timestamp can be a Java time pattern or one of the following formats: ISO8601, UNIX, UNIX_MS, or TAI64N. See the {ref}/mapping-date-format.html[mapping date format] for more information on timestamp formats.