Find file structure APIedit

This functionality is experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.

Determines the structure of a text file and other information that will be useful to import its contents to an Elasticsearch index. It accepts a FindFileStructureRequest object and responds with a FindFileStructureResponse object.

Find file structure requestedit

A sample from the beginning of the file (or the entire file contents if it’s small) must be added to the FindFileStructureRequest object using the FindFileStructureRequest#setSample method.

FindFileStructureRequest findFileStructureRequest = new FindFileStructureRequest(); 
findFileStructureRequest.setSample(Files.readAllBytes(anInterestingFile)); 

Create a new FindFileStructureRequest object

Add the contents of anInterestingFile to the request

Optional argumentsedit

The following arguments are optional.

findFileStructureRequest.setLinesToSample(500); 
findFileStructureRequest.setExplain(true); 

Set the maximum number of lines to sample (the entire sample will be used if it contains fewer lines)

Request that an explanation of the analysis be returned in the response

Synchronous executionedit

When executing a FindFileStructureRequest in the following manner, the client waits for the FindFileStructureResponse to be returned before continuing with code execution:

FindFileStructureResponse findFileStructureResponse =
    client.machineLearning().findFileStructure(findFileStructureRequest, RequestOptions.DEFAULT);

Synchronous calls may throw an IOException in case of either failing to parse the REST response in the high-level REST client, the request times out or similar cases where there is no response coming back from the server.

In cases where the server returns a 4xx or 5xx error code, the high-level client tries to parse the response body error details instead and then throws a generic ElasticsearchException and adds the original ResponseException as a suppressed exception to it.

Asynchronous executionedit

Executing a FindFileStructureRequest can also be done in an asynchronous fashion so that the client can return directly. Users need to specify how the response or potential failures will be handled by passing the request and a listener to the asynchronous find-file-structure method:

client.machineLearning().findFileStructureAsync(findFileStructureRequest, RequestOptions.DEFAULT, listener); 

The FindFileStructureRequest to execute and the ActionListener to use when the execution completes

The asynchronous method does not block and returns immediately. Once it is completed the ActionListener is called back using the onResponse method if the execution successfully completed or using the onFailure method if it failed. Failure scenarios and expected exceptions are the same as in the synchronous execution case.

A typical listener for find-file-structure looks like:

ActionListener<FindFileStructureResponse> listener = new ActionListener<FindFileStructureResponse>() {
    @Override
    public void onResponse(FindFileStructureResponse findFileStructureResponse) {
        
    }

    @Override
    public void onFailure(Exception e) {
        
    }
};

Called when the execution is successfully completed.

Called when the whole FindFileStructureRequest fails.

Find file structure responseedit

A FindFileStructureResponse contains information about the file structure, as well as mappings and an ingest pipeline that could be used to index the contents into Elasticsearch.

FileStructure structure = findFileStructureResponse.getFileStructure(); 

The FileStructure object contains the structure information