How can we extract transaction id from an event and do a search to display all events having that transaction ID?

[diliphg]

I am fairly new to Splunk queries.

I have below mentioned logs:

INFO [HTTP-120]: 2017-08-02T18:00:03,157 - transactionID=12345 - "Internal Server Error"
INFO [HTTP-120]: 2017-08-02T18:00:02,110 - transactionID=12345 - "Foo"
INFO [HTTP-120]: 2017-08-02T18:00:01,100 - transactionID=12345 - "Bar"

INFO [HTTP-120]: 2017-08-02T18:00:03,157 - transactionID=45678 - "Success"
INFO [HTTP-120]: 2017-08-02T18:00:02,110 - transactionID=45678 - "Foo"
INFO [HTTP-120]: 2017-08-02T18:00:01,100 - transactionID=45678 - "Bar"

I need to search for events which has "Internal Server Error" then extract the transactionID and do a new search to print all the events which has that transactionID.
So my output should be
INFO [HTTP-120]: 2017-08-02T18:00:03,157 - transactionID=12345 - "Internal Server Error"
INFO [HTTP-120]: 2017-08-02T18:00:02,110 - transactionID=12345 - "Foo"
INFO [HTTP-120]: 2017-08-02T18:00:01,100 - transactionID=12345 - "Bar"

The query should not fail if there are no events. I used subquery to return transactionID for base query, but for 0 events it failed saying Comparator '=' has missing right side value.

Any help is much appreciated.

[DalJeanis]

Try this...

index=baz    [ index=baz  "Internal Server Error" transactionID=* | stats by transactionID]

The stuff in braces, because of an implicit format command, translates to...

  ( transactionID="Value1" OR  transactionID="Value2" OR ...)

If nothing comes back from the braces, it comes out as...

NOT ()

...which is valid but will return no results.

[diliphg]

Still doesn't work.

This query gives the stats "index=baz "Internal Server Error" transactionID=* | stats by transactionID".

But this whole query index=baz [search index=baz "Internal Server Error" transactionID=* | stats by transactionID] says 0 events found.

Since i am new please help if there are any silly mistakes.