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Logstash Reference [8.2] » Filter plugins » Translate filter plugin
« Tld filter plugin Truncate filter plugin »
TRANSLATE FILTER PLUGINEDIT
* Plugin version: v3.3.0
* Released on: 2021-06-30
* Changelog
For other versions, see the Versioned plugin docs.
GETTING HELPEDIT
For questions about the plugin, open a topic in the Discuss forums. For bugs or
feature requests, open an issue in Github. For the list of Elastic supported
plugins, please consult the Elastic Support Matrix.
DESCRIPTIONEDIT
A general search and replace tool that uses a configured hash and/or a file to
determine replacement values. Currently supported are YAML, JSON, and CSV files.
Each dictionary item is a key value pair.
You can specify dictionary entries in one of two ways:
* The dictionary configuration item can contain a hash representing the
mapping.
* An external file (readable by logstash) may be specified in the
dictionary_path configuration item.
These two methods may not be used in conjunction; it will produce an error.
Operationally, for each event, the value from the source setting is tested
against the dictionary and if it matches exactly (or matches a regex when regex
configuration item has been enabled), the matched value is put in the target
field, but on no match the fallback setting string is used instead.
Example:
filter {
translate {
source => "[http][response][status_code]"
target => "[http_status_description]"
dictionary => {
"100" => "Continue"
"101" => "Switching Protocols"
"200" => "OK"
"500" => "Server Error"
}
fallback => "I'm a teapot"
}
}
Occasionally, people find that they have a field with a variable sized array of
values or objects that need some enrichment. The iterate_on setting helps in
these cases.
Alternatively, for simple string search and replacements for just a few values
you might consider using the gsub function of the mutate filter.
It is possible to provide multi-valued dictionary values. When using a YAML or
JSON dictionary, you can have the value as a hash (map) or an array datatype.
When using a CSV dictionary, multiple values in the translation must be
extracted with another filter e.g. Dissect or KV.
Note that the fallback is a string so on no match the fallback setting needs to
formatted so that a filter can extract the multiple values to the correct
fields.
File based dictionaries are loaded in a separate thread using a scheduler. If
you set a refresh_interval of 300 seconds (5 minutes) or less then the modified
time of the file is checked before reloading. Very large dictionaries are
supported, internally tested at 100 000 key/values, and we minimise the impact
on throughput by having the refresh in the scheduler thread. Any ongoing
modification of the dictionary file should be done using a copy/edit/rename or
create/rename mechanism to avoid the refresh code from processing half-baked
dictionary content.
COMPATIBILITY WITH THE ELASTIC COMMON SCHEMA (ECS)EDIT
The plugin acts as an in-place translator if source and target are the same and
does not produce any new event fields. This is the default behavior in ECS
compatibility mode.
TRANSLATE FILTER CONFIGURATION OPTIONSEDIT
This plugin supports the following configuration options plus the Common Options
described later.
Setting Input type Required
destination
string
No
dictionary
hash
No
dictionary_path
a valid filesystem path
No
ecs_compatibility
string
No
exact
boolean
No
fallback
string
No
field
string
No
iterate_on
string
No
override
boolean
No
refresh_interval
number
No
regex
boolean
No
source
string
Yes
refresh_behaviour
string
No
target
string
No
Also see Common Options for a list of options supported by all filter plugins.
DESTINATIONEDIT
* Value type is string
* Deprecated alias for target setting.
DEPRECATED IN 3.3.0.
Use target instead. In 4.0 this setting will be removed.
DICTIONARYEDIT
* Value type is hash
* Default value is {}
The dictionary to use for translation, when specified in the logstash filter
configuration item (i.e. do not use the dictionary_path file).
Example:
filter {
translate {
dictionary => {
"100" => "Continue"
"101" => "Switching Protocols"
"merci" => "thank you"
"old version" => "new version"
}
}
}
It is an error to specify both dictionary and dictionary_path.
DICTIONARY_PATHEDIT
* Value type is path
* There is no default value for this setting.
The full path of the external dictionary file. The format of the table should be
a standard YAML, JSON, or CSV.
Specify any integer-based keys in quotes. The value taken from the event’s
source setting is converted to a string. The lookup dictionary keys must also be
strings, and the quotes make the integer-based keys function as a string. For
example, the YAML file should look something like this:
"100": Continue
"101": Switching Protocols
merci: gracias
old version: new version
It is an error to specify both dictionary and dictionary_path.
The currently supported formats are YAML, JSON, and CSV. Format selection is
based on the file extension: json for JSON, yaml or yml for YAML, and csv for
CSV. The CSV format expects exactly two columns, with the first serving as the
original text (lookup key), and the second column as the translation.
ECS_COMPATIBILITYEDIT
* Value type is string
* Supported values are:
* disabled: disabled ECS-compatibility
* v1, v8: compatibility with the specified major version of the Elastic
Common Schema
* Default value depends on which version of Logstash is running:
* When Logstash provides a pipeline.ecs_compatibility setting, its value is
used as the default
* Otherwise, the default value is disabled.
Controls this plugin’s compatibility with the Elastic Common Schema (ECS). The
value of this setting affects the default value of target.
EXACTEDIT
* Value type is boolean
* Default value is true
When exact => true, the translate filter will populate the destination field
with the exact contents of the dictionary value. When exact => false, the filter
will populate the destination field with the result of any existing destination
field’s data, with the translated value substituted in-place.
For example, consider this simple translation.yml, configured to check the data
field:
foo: bar
If logstash receives an event with the data field set to foo, and exact => true,
the destination field will be populated with the string bar. If exact => false,
and logstash receives the same event, the destination field will be also set to
bar. However, if logstash receives an event with the data field set to foofing,
the destination field will be set to barfing.
Set both exact => true AND regex => `true if you would like to match using
dictionary keys as regular expressions. A large dictionary could be expensive to
match in this case.
FALLBACKEDIT
* Value type is string
* There is no default value for this setting.
In case no translation occurs in the event (no matches), this will add a default
translation string, which will always populate field, if the match failed.
For example, if we have configured fallback => "no match", using this
dictionary:
foo: bar
Then, if logstash received an event with the field foo set to bar, the
destination field would be set to bar. However, if logstash received an event
with foo set to nope, then the destination field would still be populated, but
with the value of no match. This configuration can be dynamic and include parts
of the event using the %{field} syntax.
FIELDEDIT
* Value type is string
* Deprecated alias for source setting.
DEPRECATED IN 3.3.0.
Use source instead. In 4.0 this setting will be removed.
ITERATE_ONEDIT
* Value type is string
* There is no default value for this setting.
When the value that you need to perform enrichment on is a variable sized array
then specify the field name in this setting. This setting introduces two modes,
1) when the value is an array of strings and 2) when the value is an array of
objects (as in JSON object).
In the first mode, you should have the same field name in both source and
iterate_on, the result will be an array added to the field specified in the
target setting. This array will have the looked up value (or the fallback value
or nil) in same ordinal position as each sought value.
In the second mode, specify the field that has the array of objects in
iterate_on then specify the field in each object that provides the sought value
with source and the field to write the looked up value (or the fallback value)
to with target.
For a dictionary of:
100,Yuki
101,Rupert
102,Ahmed
103,Kwame
Example of Mode 1
filter {
translate {
iterate_on => "[collaborator_ids]"
source => "[collaborator_ids]"
target => "[collaborator_names]"
fallback => "Unknown"
}
}
Before
{
"collaborator_ids": [100,103,110,102]
}
After
{
"collaborator_ids": [100,103,110,102],
"collabrator_names": ["Yuki","Kwame","Unknown","Ahmed"]
}
Example of Mode 2
filter {
translate {
iterate_on => "[collaborators]"
source => "[id]"
target => "[name]"
fallback => "Unknown"
}
}
Before
{
"collaborators": [
{
"id": 100
},
{
"id": 103
},
{
"id": 110
},
{
"id": 101
}
]
}
After
{
"collaborators": [
{
"id": 100,
"name": "Yuki"
},
{
"id": 103,
"name": "Kwame"
},
{
"id": 110,
"name": "Unknown"
},
{
"id": 101,
"name": "Rupert"
}
]
}
OVERRIDEEDIT
* Value type is boolean
* Default value depends on whether in-place translation is being used
If the destination (or target) field already exists, this configuration option
controls whether the filter skips translation (default behavior) or overwrites
the target field value with the new translation value.
In case of in-place translation, where target is the same as source (such as
when ecs_compatibility is enabled), overwriting is allowed.
REFRESH_INTERVALEDIT
* Value type is number
* Default value is 300
When using a dictionary file, this setting will indicate how frequently (in
seconds) logstash will check the dictionary file for updates.
A value of zero or less will disable refresh.
REGEXEDIT
* Value type is boolean
* Default value is false
To treat dictionary keys as regular expressions, set regex => true.
Be sure to escape dictionary key strings for use with regex. Resources on regex
formatting are available online.
REFRESH_BEHAVIOUREDIT
* Value type is string
* Default value is merge
When using a dictionary file, this setting indicates how the update will be
executed. Setting this to merge causes the new dictionary to be merged into the
old one. This means same entry will be updated but entries that existed before
but not in the new dictionary will remain after the merge; replace causes the
whole dictionary to be replaced with a new one (deleting all entries of the old
one on update).
SOURCEEDIT
* This is a required setting.
* Value type is string
* There is no default value for this setting.
The name of the logstash event field containing the value to be compared for a
match by the translate filter (e.g. message, host, response_code).
If this field is an array, only the first value will be used.
TARGETEDIT
* Value type is string
* Default value depends on whether ecs_compatibility is enabled:
* ECS Compatibility disabled: "translation"
* ECS Compatibility enabled: defaults to the same value as source
The target field you wish to populate with the translated code. If you set this
value to the same value as source field, the plugin does a substitution, and the
filter will succeed. This will clobber the old value of the source field!
COMMON OPTIONSEDIT
The following configuration options are supported by all filter plugins:
Setting Input type Required
add_field
hash
No
add_tag
array
No
enable_metric
boolean
No
id
string
No
periodic_flush
boolean
No
remove_field
array
No
remove_tag
array
No
ADD_FIELDEDIT
* Value type is hash
* Default value is {}
If this filter is successful, add any arbitrary fields to this event. Field
names can be dynamic and include parts of the event using the %{field}.
Example:
filter {
translate {
add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
}
}
# You can also add multiple fields at once:
filter {
translate {
add_field => {
"foo_%{somefield}" => "Hello world, from %{host}"
"new_field" => "new_static_value"
}
}
}
If the event has field "somefield" == "hello" this filter, on success, would add
field foo_hello if it is present, with the value above and the %{host} piece
replaced with that value from the event. The second example would also add a
hardcoded field.
ADD_TAGEDIT
* Value type is array
* Default value is []
If this filter is successful, add arbitrary tags to the event. Tags can be
dynamic and include parts of the event using the %{field} syntax.
Example:
filter {
translate {
add_tag => [ "foo_%{somefield}" ]
}
}
# You can also add multiple tags at once:
filter {
translate {
add_tag => [ "foo_%{somefield}", "taggedy_tag"]
}
}
If the event has field "somefield" == "hello" this filter, on success, would add
a tag foo_hello (and the second example would of course add a taggedy_tag tag).
ENABLE_METRICEDIT
* Value type is boolean
* Default value is true
Disable or enable metric logging for this specific plugin instance. By default
we record all the metrics we can, but you can disable metrics collection for a
specific plugin.
IDEDIT
* Value type is string
* There is no default value for this setting.
Add a unique ID to the plugin configuration. If no ID is specified, Logstash
will generate one. It is strongly recommended to set this ID in your
configuration. This is particularly useful when you have two or more plugins of
the same type, for example, if you have 2 translate filters. Adding a named ID
in this case will help in monitoring Logstash when using the monitoring APIs.
filter {
translate {
id => "ABC"
}
}
Variable substitution in the id field only supports environment variables and
does not support the use of values from the secret store.
PERIODIC_FLUSHEDIT
* Value type is boolean
* Default value is false
Call the filter flush method at regular interval. Optional.
REMOVE_FIELDEDIT
* Value type is array
* Default value is []
If this filter is successful, remove arbitrary fields from this event. Fields
names can be dynamic and include parts of the event using the %{field} Example:
filter {
translate {
remove_field => [ "foo_%{somefield}" ]
}
}
# You can also remove multiple fields at once:
filter {
translate {
remove_field => [ "foo_%{somefield}", "my_extraneous_field" ]
}
}
If the event has field "somefield" == "hello" this filter, on success, would
remove the field with name foo_hello if it is present. The second example would
remove an additional, non-dynamic field.
REMOVE_TAGEDIT
* Value type is array
* Default value is []
If this filter is successful, remove arbitrary tags from the event. Tags can be
dynamic and include parts of the event using the %{field} syntax.
Example:
filter {
translate {
remove_tag => [ "foo_%{somefield}" ]
}
}
# You can also remove multiple tags at once:
filter {
translate {
remove_tag => [ "foo_%{somefield}", "sad_unwanted_tag"]
}
}
If the event has field "somefield" == "hello" this filter, on success, would
remove the tag foo_hello if it is present. The second example would remove a
sad, unwanted tag as well.
« Tld filter plugin Truncate filter plugin »
ON THIS PAGE
* Getting Help
* Description
* Compatibility with the Elastic Common Schema (ECS)
* Translate Filter Configuration Options
* destination
* dictionary
* dictionary_path
* ecs_compatibility
* exact
* fallback
* field
* iterate_on
* override
* refresh_interval
* regex
* refresh_behaviour
* source
* target
* Common Options
* add_field
* add_tag
* enable_metric
* id
* periodic_flush
* remove_field
* remove_tag
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