Breaking API changes in 7.0edit

Camel case and underscore parameters deprecated in 6.x have been removededit

A number of duplicate parameters deprecated in 6.x have been removed from Bulk request, Multi Get request, Term Vectors request, and More Like This Query requests.

The following camel case parameters have been removed:

  • opType
  • versionType, _versionType

The following parameters starting with underscore have been removed:

  • _parent
  • _retry_on_conflict
  • _routing
  • _version
  • _version_type

Instead of these removed parameters, use their non camel case equivalents without starting underscore, e.g. use version_type instead of _version_type or versionType.

Thread pool infoedit

In previous versions of Elasticsearch, the thread pool info returned in the nodes info API returned min and max values reflecting the configured minimum and maximum number of threads that could be in each thread pool. The trouble with this representation is that it does not align with the configuration parameters used to configure thread pools. For scaling thread pools, the minimum number of threads is configured by a parameter called core and the maximum number of threads is configured by a parameter called max. For fixed thread pools, there is only one configuration parameter along these lines and that parameter is called size, reflecting the fixed number of threads in the pool. This discrepancy between the API and the configuration parameters has been rectified. Now, the API will report core and max for scaling thread pools, and size for fixed thread pools.

Similarly, in the cat thread pool API the existing size output has been renamed to pool_size which reflects the number of threads currently in the pool; the shortcut for this value has been changed from s to psz. The min output has been renamed to core with a shortcut of cr, the shortcut for max has been changed to mx, and the size output with a shortcut of sz has been reused to report the configured number of threads in the pool. This aligns the output of the API with the configuration values for thread pools. Note that core and max will be populated for scaling thread pools, and size will be populated for fixed thread pools.

The parameter fields deprecated in 6.x has been removed from Bulk requestedit

and Update request. The Update API returns 400 - Bad request if request contains unknown parameters (instead of ignored in the previous version).

Remove support for suggest metric/index metric in indices stats and nodes stats APIsedit

Previously, suggest stats were folded into search stats. Support for the suggest metric on the indices stats and nodes stats APIs remained for backwards compatibility. Backwards support for the suggest metric was deprecated in 6.3.0 and now removed in 7.0.0.

In the past, fields could be provided either as a parameter, or as part of the request body. Specifying fields in the request body as opposed to a parameter was deprecated in 6.4.0, and is now unsupported in 7.0.0.

copy_settings is deprecated on shrink and split APIsedit

Versions of Elasticsearch prior to 6.4.0 did not copy index settings on shrink and split operations. Starting with Elasticsearch 7.0.0, the default behavior will be for such settings to be copied on such operations. To enable users in 6.4.0 to transition in 6.4.0 to the default behavior in 7.0.0, the copy_settings parameter was added on the REST layer. As this behavior will be the only behavior in 8.0.0, this parameter is deprecated in 7.0.0 for removal in 8.0.0.