fields.conf

The following are the spec and example files for fields.conf.

fields.conf.spec

   Version 7.3.5

 This file contains possible attribute and value pairs for:
  * Telling Splunk how to handle multi-value fields.
  * Distinguishing indexed and extracted fields.
  * Improving search performance by telling the search processor how to
    handle field values.

 Use this file if you are creating a field at index time (not advised).

 There is a fields.conf in $SPLUNK_HOME/etc/system/default/.  To set custom
 configurations, place a fields.conf in $SPLUNK_HOME/etc/system/local/.  For
 examples, see fields.conf.example.  You must restart Splunk to enable
 configurations.

 To learn more about configuration files (including precedence) please see the
 documentation located at
 http://docs.splunk.com/Documentation/Splunk/latest/Admin/Aboutconfigurationfiles

GLOBAL SETTINGS

 Use the [default] stanza to define any global settings.
   * You can also define global settings outside of any stanza, at the top of
     the file.
   * Each conf file should have at most one default stanza. If there are
     multiple default stanzas, attributes are combined. In the case of
     multiple definitions of the same attribute, the last definition in the
     file wins.
   * If an attribute is defined at both the global level and in a specific
     stanza, the value in the specific stanza takes precedence.

[<field name>]

* Name of the field you're configuring.
* Follow this stanza name with any number of the following attribute/value
  pairs.
* Field names can only contain a-z, A-Z, 0-9, and  _, but cannot begin with a
  number or _

 TOKENIZER indicates that your configured field's value is a smaller part of a
 token.  For example, your field's value is "123" but it occurs as "foo123" in
 your event.
TOKENIZER = <regular expression>
* Use this setting to configure multivalue fields (refer to the online
  documentation for multivalue fields).
* A regular expression that indicates how the field can take on multiple values
  at the same time.
* If empty, the field can only take on a single value.
* Otherwise, the first group is taken from each match to form the set of
  values.
* This setting is used by the "search" and "where" commands, the summary and
  XML outputs of the asynchronous search API, and by the top, timeline and
  stats commands.
* Tokenization of indexed fields (INDEXED = true) is not supported so this
  attribute is ignored for indexed fields.
* Default to empty.

INDEXED = [true|false]
* Indicate whether a field is indexed or not.
* Set to true if the field is indexed.
* Set to false for fields extracted at search time (the majority of fields).
* Defaults to false.

INDEXED_VALUE = [true|false|<sed-cmd>|<simple-substitution-string>]
* Set this to true if the value is in the raw text of the event.
* Set this to false if the value is not in the raw text of the event.
* Setting this to true expands any search for key=value into a search of
  value AND key=value (since value is indexed).
* For advanced customization, this setting supports sed style substitution.
  For example, 'INDEXED_VALUE=s/foo/bar/g' would take the value of the field,
  replace all instances of 'foo' with 'bar,' and use that new value as the
  value to search in the index.
* This setting also supports a simple substitution based on looking for the
  literal string '<VALUE>' (including the '<' and '>' characters).
  For example, 'INDEXED_VALUE=source::*<VALUE>*' would take a search for
  'myfield=myvalue' and search for 'source::*myvalue*' in the index as a
  single term.
* For both substitution constructs, if the resulting string starts with a '[',
  Splunk interprets the string as a Splunk LISPY expression.  For example,
  'INDEXED_VALUE=[OR <VALUE> source::*<VALUE>]' would turn 'myfield=myvalue'
  into applying the LISPY expression '[OR myvalue source::*myvalue]' (meaning
  it matches either 'myvalue' or 'source::*myvalue' terms).
* Defaults to true.
* NOTE: You only need to set indexed_value if indexed = false.

fields.conf.example

#   Version 7.3.5
#
# This file contains an example fields.conf.  Use this file to configure
# dynamic field extractions.
#
# To use one or more of these configurations, copy the configuration block into
# fields.conf in $SPLUNK_HOME/etc/system/local/. You must restart Splunk to
# enable configurations.
#
# To learn more about configuration files (including precedence) please see the
# documentation located at
# http://docs.splunk.com/Documentation/Splunk/latest/Admin/Aboutconfigurationfiles
#
# These tokenizers result in the values of To, From and Cc treated as a list,
# where each list element is an email address found in the raw string of data.

[To]
TOKENIZER = (\w[\w\.\-]*@[\w\.\-]*\w)

[From]
TOKENIZER = (\w[\w\.\-]*@[\w\.\-]*\w)

[Cc]
TOKENIZER = (\w[\w\.\-]*@[\w\.\-]*\w)