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diff --git a/src/main/java/org/onap/aai/sa/searchdbabstraction/searchapi/AbstractAggregation.java b/src/main/java/org/onap/aai/sa/searchdbabstraction/searchapi/AbstractAggregation.java
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+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 Amdocs
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ *
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ */
+package org.onap.aai.sa.searchdbabstraction.searchapi;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+
+/**
+ * This is the common parent from which all aggregation types inherit.  It defines
+ * the common fields that all aggregations must include.
+ */
+public abstract class AbstractAggregation {
+
+  /**
+   * The name of the field to apply the aggregation against.
+   */
+  protected String field;
+
+  /**
+   * Optionally allows the number of buckets for the aggregation to be
+   * specified.
+   */
+  protected Integer size;
+
+  /**
+   * Optionally sets the minimum number of matches that must occur before
+   * a particular bucket is included in the aggregation result.
+   */
+  @JsonProperty("min-threshold")
+  protected Integer minThreshold;
+
+
+  public String getField() {
+    return field;
+  }
+
+  public void setField(String field) {
+    this.field = field;
+  }
+
+  public Integer getSize() {
+    return size;
+  }
+
+  public void setSize(Integer size) {
+    this.size = size;
+  }
+
+  public Integer getMinThreshold() {
+    return minThreshold;
+  }
+
+  public void setMinThreshold(Integer minThreshold) {
+    this.minThreshold = minThreshold;
+  }
+
+  public abstract String toElasticSearch();
+
+  public abstract String toString();
+}