Remove references to 'mapping type' section. (#1440)

These pages are being removed in the mainline docs due to the removal
of types as a whole.

docs/src/reference/asciidoc/core/mapping.adoc

@@ -60,7 +60,7 @@ Note that typically handling of these types poses no issues for the user whether
 By default, {es} provides {ref}/docs-index_.html[automatic index and mapping] when data is added under an index that has not been created before. In other words, data can be added into {es} without the index and the mappings being defined a priori. This is quite convenient since {es} automatically adapts to the data being fed to it - moreover, if certain entries have extra fields, {es} schema-less nature allows them to be indexed without any issues.
 
 [[auto-mapping-type-loss]]
-It is important to remember that automatic mapping uses the payload values to identify its {ref}/mapping.html#mapping-type[type], using the *first document* creates the mapping. {eh} communicates with {es} through JSON which does not provide any type information, rather only the field names and their values. One can think of it as 'type erasure' or information loss; for example JSON does not differentiate integer numeric types - `byte`, `short`, `int`, `long` are all placed in the same `long` 'bucket'. this can have unexpected side-effects since the type information is _guessed_ such as:
+It is important to remember that automatic mapping uses the payload values to identify the {ref}/mapping.html#field-datatypes[field types], using the *first document* that adds each field. {eh} communicates with {es} through JSON which does not provide any type information, rather only the field names and their values. One can think of it as 'type erasure' or information loss; for example JSON does not differentiate integer numeric types - `byte`, `short`, `int`, `long` are all placed in the same `long` 'bucket'. this can have unexpected side-effects since the type information is _guessed_ such as:
 
 [float]
 ===== numbers mapped only as `long`/`double`

docs/src/reference/asciidoc/core/mr.adoc

@@ -381,7 +381,7 @@ conf.set("es.resource.write", "sink/group");
 
 IMPORTANT: If automatic index creation is used, please review <<auto-mapping-type-loss,this>> section for more information.
 
-{eh} automatically converts Hadoop built-in `Writable` types to {es} {ref}/mapping.html#mapping-type[types] (and back) as shown in the table below:
+{eh} automatically converts Hadoop built-in `Writable` types to {es} {ref}/mapping.html#field-datatypes[field types] (and back) as shown in the table below:
 
 .`Writable` Conversion Table