Message content based INDEX

I am an infant as far as Logstash+Elasticsearch is concerned. Could someone
help me out on the following:

I need to create INDEX based on the content of ACTUAL MESSAGE part of a
message forwarded to elasticsearch by Logstash.

For example:

<6> Jan 9 07:19:26 w2k8r233110 CEF:0|Trend Micro|Deep Security
Manager|8.0.1310|173|Anti-Malware Quarantined File List
Exported|3|src=10.100.33.110 suser=System target=10.100.33.111
msg=Installation/Upgrade of Anti-Malware Component on Agent
Succeeded.\n\nPrevious Version: \nCurrent Version: {1}\n

In this message, the actual message part is :

CEF:0|Trend Micro|Deep Security Manager|8.0.1310|173|Anti-Malware
Quarantined File List Exported|3|src=10.100.33.110 suser=System
target=10.100.33.111 msg=Installation/Upgrade of Anti-Malware Component on
Agent Succeeded.\n\nPrevious Version: \nCurrent Version: {1}

I need to create index based on 10.100.33.110 so that all messages with
this source comes in one document.

Thank you in advance.

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