diff --git a/x-pack/legacy/plugins/maps/public/layers/joins/left_inner_join.js b/x-pack/legacy/plugins/maps/public/layers/joins/inner_join.js
similarity index 94%
rename from x-pack/legacy/plugins/maps/public/layers/joins/left_inner_join.js
rename to x-pack/legacy/plugins/maps/public/layers/joins/inner_join.js
index 372e23b2f489b3..dac05128e8d292 100644
--- a/x-pack/legacy/plugins/maps/public/layers/joins/left_inner_join.js
+++ b/x-pack/legacy/plugins/maps/public/layers/joins/inner_join.js
@@ -5,14 +5,14 @@
  */
 
 
-import { ESJoinSource } from '../sources/es_join_source';
+import { ESTermSource } from '../sources/es_term_source';
 import { VectorStyle } from '../styles/vector_style';
 
-export class LeftInnerJoin {
+export class InnerJoin {
 
   constructor(joinDescriptor, inspectorAdapters) {
     this._descriptor = joinDescriptor;
-    this._rightSource = new ESJoinSource(joinDescriptor.right, inspectorAdapters);
+    this._rightSource = new ESTermSource(joinDescriptor.right, inspectorAdapters);
   }
 
   destroy() {
diff --git a/x-pack/legacy/plugins/maps/public/layers/joins/left_inner_join.test.js b/x-pack/legacy/plugins/maps/public/layers/joins/inner_join.test.js
similarity index 95%
rename from x-pack/legacy/plugins/maps/public/layers/joins/left_inner_join.test.js
rename to x-pack/legacy/plugins/maps/public/layers/joins/inner_join.test.js
index f6f9a96390f322..0a5a885739f865 100644
--- a/x-pack/legacy/plugins/maps/public/layers/joins/left_inner_join.test.js
+++ b/x-pack/legacy/plugins/maps/public/layers/joins/inner_join.test.js
@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { LeftInnerJoin } from './left_inner_join';
+import { InnerJoin } from './inner_join';
 
 jest.mock('ui/vis/editors/default/schemas', () => {
   class MockSchemas {}
@@ -25,7 +25,7 @@ const rightSource = {
   term: 'geo.dest',
 };
 
-const leftJoin = new LeftInnerJoin({
+const leftJoin = new InnerJoin({
   leftField: 'iso2',
   right: rightSource
 });
@@ -73,7 +73,7 @@ describe('joinPropertiesToFeature', () => {
 
   it('Should coerce to string before joining', () => {
 
-    const leftJoin = new LeftInnerJoin({
+    const leftJoin = new InnerJoin({
       leftField: 'zipcode',
       right: rightSource
     });
@@ -115,7 +115,7 @@ describe('joinPropertiesToFeature', () => {
 
   it('Should handle falsy values', () => {
 
-    const leftJoin = new LeftInnerJoin({
+    const leftJoin = new InnerJoin({
       leftField: 'code',
       right: rightSource
     });
diff --git a/x-pack/legacy/plugins/maps/public/layers/sources/es_join_source.js b/x-pack/legacy/plugins/maps/public/layers/sources/es_term_source.js
similarity index 94%
rename from x-pack/legacy/plugins/maps/public/layers/sources/es_join_source.js
rename to x-pack/legacy/plugins/maps/public/layers/sources/es_term_source.js
index cd2b3151948c2b..ad404d9af1eadf 100644
--- a/x-pack/legacy/plugins/maps/public/layers/sources/es_join_source.js
+++ b/x-pack/legacy/plugins/maps/public/layers/sources/es_term_source.js
@@ -54,9 +54,9 @@ export function extractPropertiesMap(rawEsData, propertyNames, countPropertyName
   return propertiesMap;
 }
 
-export class ESJoinSource extends AbstractESSource {
+export class ESTermSource extends AbstractESSource {
 
-  static type = 'ES_JOIN_SOURCE';
+  static type = 'ES_TERM_SOURCE';
 
 
   static renderEditor({}) {
@@ -65,11 +65,7 @@ export class ESJoinSource extends AbstractESSource {
   }
 
   hasCompleteConfig() {
-    if (_.has(this._descriptor, 'indexPatternId') && _.has(this._descriptor, 'term')) {
-      return true;
-    }
-
-    return false;
+    return (_.has(this._descriptor, 'indexPatternId') && _.has(this._descriptor, 'term'));
   }
 
   getIndexPatternIds() {
@@ -107,7 +103,7 @@ export class ESJoinSource extends AbstractESSource {
     searchSource.setField('aggs', aggConfigs.toDsl());
 
     const requestName = `${this._descriptor.indexPatternTitle}.${this._descriptor.term}`;
-    const requestDesc = this.getJoinDescription(leftSourceName, leftFieldName);
+    const requestDesc = this._getRequestDescription(leftSourceName, leftFieldName);
     const rawEsData = await this._runEsQuery(requestName, searchSource, requestDesc);
 
     const metricPropertyNames = configStates
@@ -130,7 +126,7 @@ export class ESJoinSource extends AbstractESSource {
     return false;
   }
 
-  getJoinDescription(leftSourceName, leftFieldName) {
+  _getRequestDescription(leftSourceName, leftFieldName) {
     const metrics = this._getValidMetrics().map(metric => {
       return metric.type !== 'count' ? `${metric.type} ${metric.field}` : 'count';
     });
diff --git a/x-pack/legacy/plugins/maps/public/layers/sources/es_join_source.test.js b/x-pack/legacy/plugins/maps/public/layers/sources/es_term_source.test.js
similarity index 96%
rename from x-pack/legacy/plugins/maps/public/layers/sources/es_join_source.test.js
rename to x-pack/legacy/plugins/maps/public/layers/sources/es_term_source.test.js
index 7e12a3880dc503..65bfd993c871a8 100644
--- a/x-pack/legacy/plugins/maps/public/layers/sources/es_join_source.test.js
+++ b/x-pack/legacy/plugins/maps/public/layers/sources/es_term_source.test.js
@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { ESJoinSource, extractPropertiesMap } from './es_join_source';
+import { ESTermSource, extractPropertiesMap } from './es_term_source';
 
 jest.mock('../vector_layer', () => {});
 jest.mock('ui/vis/editors/default/schemas', () => ({
@@ -37,7 +37,7 @@ const metricExamples = [
 describe('getMetricFields', () => {
 
   it('should add default "count" metric when no metrics are provided', () => {
-    const source = new ESJoinSource({
+    const source = new ESTermSource({
       indexPatternTitle: indexPatternTitle,
       term: termFieldName,
     });
@@ -51,7 +51,7 @@ describe('getMetricFields', () => {
   });
 
   it('should remove incomplete metric configurations', () => {
-    const source = new ESJoinSource({
+    const source = new ESTermSource({
       indexPatternTitle: indexPatternTitle,
       term: termFieldName,
       metrics: metricExamples,
@@ -76,7 +76,7 @@ describe('_makeAggConfigs', () => {
   describe('no metrics', () => {
     let aggConfigs;
     beforeAll(() => {
-      const source = new ESJoinSource({
+      const source = new ESTermSource({
         indexPatternTitle: indexPatternTitle,
         term: termFieldName,
       });
@@ -112,7 +112,7 @@ describe('_makeAggConfigs', () => {
   describe('metrics', () => {
     let aggConfigs;
     beforeAll(() => {
-      const source = new ESJoinSource({
+      const source = new ESTermSource({
         indexPatternTitle: indexPatternTitle,
         term: 'myTermField',
         metrics: metricExamples
diff --git a/x-pack/legacy/plugins/maps/public/layers/vector_layer.js b/x-pack/legacy/plugins/maps/public/layers/vector_layer.js
index d395f8ead1baaa..829ce8ea599f81 100644
--- a/x-pack/legacy/plugins/maps/public/layers/vector_layer.js
+++ b/x-pack/legacy/plugins/maps/public/layers/vector_layer.js
@@ -8,7 +8,7 @@ import turf from 'turf';
 import React from 'react';
 import { AbstractLayer } from './layer';
 import { VectorStyle } from './styles/vector_style';
-import { LeftInnerJoin } from './joins/left_inner_join';
+import { InnerJoin } from './joins/inner_join';
 import {
   GEO_JSON_TYPE,
   FEATURE_ID_PROPERTY_NAME,
@@ -88,7 +88,7 @@ export class VectorLayer extends AbstractLayer {
     this._joins = [];
     if (options.layerDescriptor.joins) {
       options.layerDescriptor.joins.forEach((joinDescriptor) => {
-        this._joins.push(new LeftInnerJoin(joinDescriptor, this._source.getInspectorAdapters()));
+        this._joins.push(new InnerJoin(joinDescriptor, this._source.getInspectorAdapters()));
       });
     }
   }
@@ -430,9 +430,9 @@ export class VectorLayer extends AbstractLayer {
       let isFeatureVisible = true;
       for (let j = 0; j < joinStates.length; j++) {
         const joinState = joinStates[j];
-        const leftInnerJoin = joinState.join;
-        const rightMetricFields = leftInnerJoin.getRightMetricFields();
-        const canJoinOnCurrent = leftInnerJoin.joinPropertiesToFeature(feature, joinState.propertiesMap, rightMetricFields);
+        const InnerJoin = joinState.join;
+        const rightMetricFields = InnerJoin.getRightMetricFields();
+        const canJoinOnCurrent = InnerJoin.joinPropertiesToFeature(feature, joinState.propertiesMap, rightMetricFields);
         isFeatureVisible = isFeatureVisible && canJoinOnCurrent;
       }
 
diff --git a/x-pack/legacy/plugins/maps/public/layers/vector_layer.test.js b/x-pack/legacy/plugins/maps/public/layers/vector_layer.test.js
index 85937c2783cce6..0a07582c57856d 100644
--- a/x-pack/legacy/plugins/maps/public/layers/vector_layer.test.js
+++ b/x-pack/legacy/plugins/maps/public/layers/vector_layer.test.js
@@ -4,8 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-jest.mock('./joins/left_inner_join', () => ({
-  LeftInnerJoin: Object
+jest.mock('./joins/inner_join', () => ({
+  InnerJoin: Object
 }));
 
 jest.mock('./tooltips/join_tooltip_property', () => ({