How to define/process NiFi FlowFile content without a schema? -

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i have been experimenting nifi (via hortonworks hdf) , can't grasp seems basic. start file..i want filter records based on value (e.g., field number 2 contains "xyz")...then write matching records hdfs.

i have non-filtered flow working can't find docs or examples showing how apply schema (or in way understand "content") of file.

what missing?

(i have seen references flowfiles being "schema-less" - not sure how useful).

for example, file this:

[app1][field1][field2] [app2][field1][field2] [app2][field1][field2][field3] [app3][field1]

i want filter select records containing "[app2]" , create hdfs file looks this:

field1,field2 field1,field2,field3


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